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Vulnerability Details :

CVE-2026-0621

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-05 Jan, 2026 | 20:57
Updated At-05 Mar, 2026 | 01:30
Rejected At-
Credits

MCP TypeScript SDK UriTemplate Exploded Array Pattern ReDoS

Anthropic's MCP TypeScript SDK versions up to and including 1.25.1 contain a regular expression denial of service (ReDoS) vulnerability in the UriTemplate class when processing RFC 6570 exploded array patterns. The dynamically generated regular expression used during URI matching contains nested quantifiers that can trigger catastrophic backtracking on specially crafted inputs, resulting in excessive CPU consumption. An attacker can exploit this by supplying a malicious URI that causes the Node.js process to become unresponsive, leading to a denial of service.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:05 Jan, 2026 | 20:57
Updated At:05 Mar, 2026 | 01:30
Rejected At:
â–¼CVE Numbering Authority (CNA)
MCP TypeScript SDK UriTemplate Exploded Array Pattern ReDoS

Anthropic's MCP TypeScript SDK versions up to and including 1.25.1 contain a regular expression denial of service (ReDoS) vulnerability in the UriTemplate class when processing RFC 6570 exploded array patterns. The dynamically generated regular expression used during URI matching contains nested quantifiers that can trigger catastrophic backtracking on specially crafted inputs, resulting in excessive CPU consumption. An attacker can exploit this by supplying a malicious URI that causes the Node.js process to become unresponsive, leading to a denial of service.

Affected Products
Vendor
Anthropic
Product
MCP TypeScript SDK
Repo
https://github.com/modelcontextprotocol/typescript-sdk
Default Status
unaffected
Versions
Affected
  • From 0 through 1.25.1 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-1333CWE-1333 Inefficient Regular Expression Complexity
Type: CWE
CWE ID: CWE-1333
Description: CWE-1333 Inefficient Regular Expression Complexity
Metrics
VersionBase scoreBase severityVector
4.08.7HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

finder
Weblover
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/modelcontextprotocol/typescript-sdk/issues/965
issue-tracking
https://www.vulncheck.com/advisories/mcp-typescript-sdk-uritemplate-exploded-array-pattern-redos
third-party-advisory
Hyperlink: https://github.com/modelcontextprotocol/typescript-sdk/issues/965
Resource:
issue-tracking
Hyperlink: https://www.vulncheck.com/advisories/mcp-typescript-sdk-uritemplate-exploded-array-pattern-redos
Resource:
third-party-advisory
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/modelcontextprotocol/typescript-sdk/issues/965
exploit
Hyperlink: https://github.com/modelcontextprotocol/typescript-sdk/issues/965
Resource:
exploit
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:05 Jan, 2026 | 21:16
Updated At:30 Jan, 2026 | 01:16

Anthropic's MCP TypeScript SDK versions up to and including 1.25.1 contain a regular expression denial of service (ReDoS) vulnerability in the UriTemplate class when processing RFC 6570 exploded array patterns. The dynamically generated regular expression used during URI matching contains nested quantifiers that can trigger catastrophic backtracking on specially crafted inputs, resulting in excessive CPU consumption. An attacker can exploit this by supplying a malicious URI that causes the Node.js process to become unresponsive, leading to a denial of service.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.7HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CPE Matches

lfprojects
lfprojects
>>mcp_typescript_sdk>>Versions up to 1.25.1(inclusive)
cpe:2.3:a:lfprojects:mcp_typescript_sdk:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-1333Secondarydisclosure@vulncheck.com
CWE ID: CWE-1333
Type: Secondary
Source: disclosure@vulncheck.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/modelcontextprotocol/typescript-sdk/issues/965disclosure@vulncheck.com
Exploit
Issue Tracking
https://www.vulncheck.com/advisories/mcp-typescript-sdk-uritemplate-exploded-array-pattern-redosdisclosure@vulncheck.com
Third Party Advisory
https://github.com/modelcontextprotocol/typescript-sdk/issues/965134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Issue Tracking
Hyperlink: https://github.com/modelcontextprotocol/typescript-sdk/issues/965
Source: disclosure@vulncheck.com
Resource:
Exploit
Issue Tracking
Hyperlink: https://www.vulncheck.com/advisories/mcp-typescript-sdk-uritemplate-exploded-array-pattern-redos
Source: disclosure@vulncheck.com
Resource:
Third Party Advisory
Hyperlink: https://github.com/modelcontextprotocol/typescript-sdk/issues/965
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Issue Tracking

Change History

0
Information is not available yet

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Inefficient Regular Expression Complexity
CVE-2021-45470
Matching Score-4
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CVSS Score-7.5||HIGH
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||
7 Day CHG~0.00%
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
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Action-Not Available
Vendor-circln/a
Product-cve-searchn/a
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2020-1920
Matching Score-4
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Matching Score-4
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CVSS Score-7.5||HIGH
EPSS-0.21% / 42.96%
||
7 Day CHG~0.00%
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

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CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CWE ID-CWE-697
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CVE-2021-43307
Matching Score-4
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ShareView Details
Matching Score-4
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CVSS Score-5.9||MEDIUM
EPSS-0.58% / 69.18%
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7 Day CHG~0.00%
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Vendor-semver-regex_projectsemver-regex
Product-semver-regexsemver-regex
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2021-43843
Matching Score-4
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Matching Score-4
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CVSS Score-5.3||MEDIUM
EPSS-0.56% / 68.46%
||
7 Day CHG~0.00%
Published-20 Dec, 2021 | 21:15
Updated-04 Aug, 2024 | 04:10
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Insufficient patch for Regular Expression Denial of Service (ReDoS) to jsx-slack v4.5.1

jsx-slack is a package for building JSON objects for Slack block kit surfaces from JSX. The maintainers found the patch for CVE-2021-43838 in jsx-slack v4.5.1 is insufficient tfor protection from a Regular Expression Denial of Service (ReDoS) attack. If an attacker can put a lot of JSX elements into `<blockquote>` tag _with including multibyte characters_, an internal regular expression for escaping characters may consume an excessive amount of computing resources. v4.5.1 passes the test against ASCII characters but misses the case of multibyte characters. jsx-slack v4.5.2 has updated regular expressions for escaping blockquote characters to prevent catastrophic backtracking. It is also including an updated test case to confirm rendering multiple tags in `<blockquote>` with multibyte characters.

Action-Not Available
Vendor-jsx-slack_projectyhatt
Product-jsx-slackjsx-slack
CWE ID-CWE-400
Uncontrolled Resource Consumption
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2023-51931
Matching Score-4
Assigner-MITRE Corporation
ShareView Details
Matching Score-4
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-0.07% / 21.11%
||
7 Day CHG~0.00%
Published-16 Feb, 2024 | 00:00
Updated-13 Jan, 2025 | 14:28
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

An issue in alanclarke URLite v.3.1.0 allows an attacker to cause a denial of service (DoS) via a crafted payload to the parsing function.

Action-Not Available
Vendor-alanclarken/aalanclarke
Product-urliten/aurlite
CWE ID-CWE-20
Improper Input Validation
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2021-4305
Matching Score-4
Assigner-VulDB
ShareView Details
Matching Score-4
Assigner-VulDB
CVSS Score-3.5||LOW
EPSS-0.49% / 65.73%
||
7 Day CHG~0.00%
Published-05 Jan, 2023 | 10:03
Updated-25 Nov, 2024 | 17:49
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Woorank robots-txt-guard patterns.js makePathPattern redos

A vulnerability was found in Woorank robots-txt-guard. It has been rated as problematic. Affected by this issue is the function makePathPattern of the file lib/patterns.js. The manipulation of the argument pattern leads to inefficient regular expression complexity. The exploit has been disclosed to the public and may be used. The name of the patch is c03827cd2f9933619c23894ce7c98401ea824020. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-217448.

Action-Not Available
Vendor-bridgelineWoorank
Product-robots-txt-guardrobots-txt-guard
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2021-40894
Matching Score-4
Assigner-MITRE Corporation
ShareView Details
Matching Score-4
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-0.33% / 56.26%
||
7 Day CHG~0.00%
Published-24 Jun, 2022 | 21:09
Updated-04 Aug, 2024 | 02:51
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in underscore-99xp v1.7.2 when the deepValueSearch function is called.

Action-Not Available
Vendor-underscore-99xp_projectn/a
Product-underscore-99xpn/a
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2025-8262
Matching Score-4
Assigner-VulDB
ShareView Details
Matching Score-4
Assigner-VulDB
CVSS Score-5.3||MEDIUM
EPSS-0.18% / 38.79%
||
7 Day CHG~0.00%
Published-28 Jul, 2025 | 07:02
Updated-31 Jul, 2025 | 19:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
yarnpkg Yarn hosted-git-resolver.js explodeHostedGitFragment redos

A vulnerability was found in yarnpkg Yarn up to 1.22.22. It has been classified as problematic. Affected is the function explodeHostedGitFragment of the file src/resolvers/exotics/hosted-git-resolver.js. The manipulation leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The patch is identified as 97731871e674bf93bcbf29e9d3258da8685f3076. It is recommended to apply a patch to fix this issue.

Action-Not Available
Vendor-yarnpkgyarnpkg
Product-yarnYarn
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CWE ID-CWE-400
Uncontrolled Resource Consumption
CVE-2023-50249
Matching Score-4
Assigner-GitHub, Inc.
ShareView Details
Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-7.5||HIGH
EPSS-0.17% / 37.90%
||
7 Day CHG~0.00%
Published-20 Dec, 2023 | 13:53
Updated-02 Aug, 2024 | 22:09
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sentry's Astro SDK vulnerable to ReDoS

Sentry-Javascript is official Sentry SDKs for JavaScript. A ReDoS (Regular expression Denial of Service) vulnerability has been identified in Sentry's Astro SDK 7.78.0-7.86.0. Under certain conditions, this vulnerability allows an attacker to cause excessive computation times on the server, leading to denial of service (DoS). This vulnerability has been patched in sentry/astro version 7.87.0.

Action-Not Available
Vendor-sentrygetsentry
Product-astrosentry-javascript
CWE ID-CWE-400
Uncontrolled Resource Consumption
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2025-6638
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
ShareView Details
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
CVSS Score-5.3||MEDIUM
EPSS-0.03% / 9.63%
||
7 Day CHG~0.00%
Published-12 Sep, 2025 | 10:46
Updated-21 Oct, 2025 | 13:33
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Regular Expression Denial of Service (ReDoS) in huggingface/transformers

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically affecting the MarianTokenizer's `remove_language_code()` method. This vulnerability is present in version 4.52.4 and has been fixed in version 4.53.0. The issue arises from inefficient regex processing, which can be exploited by crafted input strings containing malformed language code patterns, leading to excessive CPU consumption and potential denial of service.

Action-Not Available
Vendor-huggingfacehuggingface
Product-transformershuggingface/transformers
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2021-3795
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
ShareView Details
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
CVSS Score-7.5||HIGH
EPSS-0.47% / 64.59%
||
7 Day CHG~0.00%
Published-15 Sep, 2021 | 16:23
Updated-03 Aug, 2024 | 17:09
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Inefficient Regular Expression Complexity in sindresorhus/semver-regex

semver-regex is vulnerable to Inefficient Regular Expression Complexity

Action-Not Available
Vendor-semver-regex_projectsindresorhus
Product-semver-regexsindresorhus/semver-regex
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2021-3765
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
ShareView Details
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
CVSS Score-5.3||MEDIUM
EPSS-0.04% / 13.34%
||
7 Day CHG~0.00%
Published-02 Nov, 2021 | 07:05
Updated-03 Aug, 2024 | 17:09
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Inefficient Regular Expression Complexity in validatorjs/validator.js

validator.js is vulnerable to Inefficient Regular Expression Complexity

Action-Not Available
Vendor-validator_projectvalidatorjs
Product-validatorvalidatorjs/validator.js
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2021-3822
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
ShareView Details
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
CVSS Score-5.3||MEDIUM
EPSS-0.33% / 56.26%
||
7 Day CHG~0.00%
Published-27 Sep, 2021 | 12:25
Updated-03 Aug, 2024 | 17:09
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Inefficient Regular Expression Complexity in josdejong/jsoneditor

jsoneditor is vulnerable to Inefficient Regular Expression Complexity

Action-Not Available
Vendor-jsoneditoronlinejosdejong
Product-jsoneditorjosdejong/jsoneditor
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CWE ID-CWE-400
Uncontrolled Resource Consumption
CVE-2025-66020
Matching Score-4
Assigner-GitHub, Inc.
ShareView Details
Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-7.5||HIGH
EPSS-0.11% / 28.61%
||
7 Day CHG+0.02%
Published-26 Nov, 2025 | 01:49
Updated-01 Dec, 2025 | 15:39
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Valibot has a ReDoS vulnerability in `EMOJI_REGEX`

Valibot helps validate data using a schema. In versions from 0.31.0 to 1.1.0, the EMOJI_REGEX used in the emoji action is vulnerable to a Regular Expression Denial of Service (ReDoS) attack. A short, maliciously crafted string (e.g., <100 characters) can cause the regex engine to consume excessive CPU time (minutes), leading to a Denial of Service (DoS) for the application. This issue has been patched in version 1.2.0.

Action-Not Available
Vendor-open-circle
Product-valibot
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2021-3804
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
ShareView Details
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
CVSS Score-7.5||HIGH
EPSS-0.25% / 47.98%
||
7 Day CHG~0.00%
Published-17 Sep, 2021 | 06:15
Updated-03 Aug, 2024 | 17:09
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Inefficient Regular Expression Complexity in nervjs/taro

taro is vulnerable to Inefficient Regular Expression Complexity

Action-Not Available
Vendor-taronervjs
Product-taronervjs/taro
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2025-61921
Matching Score-4
Assigner-GitHub, Inc.
ShareView Details
Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-2.7||LOW
EPSS-0.46% / 63.91%
||
7 Day CHG+0.06%
Published-10 Oct, 2025 | 19:28
Updated-31 Oct, 2025 | 16:27
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Sinatra has ReDoS vulnerability in ETag header value generation

Sinatra is a domain-specific language for creating web applications in Ruby. In versions prior to 4.2.0, there is a denial of service vulnerability in the `If-Match` and `If-None-Match` header parsing component of Sinatra, if the `etag` method is used when constructing the response. Carefully crafted input can cause `If-Match` and `If-None-Match` header parsing in Sinatra to take an unexpected amount of time, possibly resulting in a denial of service attack vector. This header is typically involved in generating the `ETag` header value. Any applications that use the `etag` method when generating a response are impacted. Version 4.2.0 fixes the issue.

Action-Not Available
Vendor-sinatrarbsinatra
Product-sinatrasinatra
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2024-8998
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
ShareView Details
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
CVSS Score-7.5||HIGH
EPSS-0.36% / 58.21%
||
7 Day CHG~0.00%
Published-20 Mar, 2025 | 10:11
Updated-04 Apr, 2025 | 09:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Regular Expression Denial of Service (ReDoS) in lunary-ai/lunary

A Regular Expression Denial of Service (ReDoS) vulnerability exists in lunary-ai/lunary version git f07a845. The server uses the regex /{.*?}/ to match user-controlled strings. In the default JavaScript regex engine, this regex can take polynomial time to match certain crafted user inputs. As a result, an attacker can cause the server to hang for an arbitrary amount of time by submitting a specially crafted payload. This issue is fixed in version 1.4.26.

Action-Not Available
Vendor-Lunary LLC
Product-lunarylunary-ai/lunary
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2021-4299
Matching Score-4
Assigner-VulDB
ShareView Details
Matching Score-4
Assigner-VulDB
CVSS Score-4.3||MEDIUM
EPSS-0.49% / 65.73%
||
7 Day CHG~0.00%
Published-02 Jan, 2023 | 07:57
Updated-03 Aug, 2024 | 17:23
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
cronvel string-kit naturalSort.js naturalSort redos

A vulnerability classified as problematic was found in cronvel string-kit up to 0.12.7. This vulnerability affects the function naturalSort of the file lib/naturalSort.js. The manipulation leads to inefficient regular expression complexity. The attack can be initiated remotely. Upgrading to version 0.12.8 is able to address this issue. The name of the patch is 9cac4c298ee92c1695b0695951f1488884a7ca73. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-217180.

Action-Not Available
Vendor-string_kit_projectcronvel
Product-string_kitstring-kit
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2024-8124
Matching Score-4
Assigner-GitLab Inc.
ShareView Details
Matching Score-4
Assigner-GitLab Inc.
CVSS Score-7.5||HIGH
EPSS-4.55% / 89.25%
||
7 Day CHG~0.00%
Published-12 Sep, 2024 | 16:56
Updated-17 Sep, 2024 | 12:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Inefficient Regular Expression Complexity in GitLab

An issue was discovered in GitLab CE/EE affecting all versions starting from 16.4 prior to 17.1.7, starting from 17.2 prior to 17.2.5, starting from 17.3 prior to 17.3.2 which could cause Denial of Service via sending a specific POST request.

Action-Not Available
Vendor-GitLab Inc.
Product-gitlabGitLab
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2023-48631
Matching Score-4
Assigner-Adobe Systems Incorporated
ShareView Details
Matching Score-4
Assigner-Adobe Systems Incorporated
CVSS Score-5.3||MEDIUM
EPSS-0.47% / 64.61%
||
7 Day CHG~0.00%
Published-14 Dec, 2023 | 13:09
Updated-02 Aug, 2024 | 21:37
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Denial of Service of regular expression in package @adobe/css-tools

@adobe/css-tools versions 4.3.1 and earlier are affected by an Improper Input Validation vulnerability that could result in a denial of service while attempting to parse CSS.

Action-Not Available
Vendor-Adobe Inc.
Product-css-toolsNot a product
CWE ID-CWE-20
Improper Input Validation
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2023-46402
Matching Score-4
Assigner-MITRE Corporation
ShareView Details
Matching Score-4
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-0.16% / 36.57%
||
7 Day CHG~0.00%
Published-17 Nov, 2023 | 00:00
Updated-02 Aug, 2024 | 20:45
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

git-urls 1.0.0 allows ReDOS (Regular Expression Denial of Service) in urls.go.

Action-Not Available
Vendor-git-urls_projectn/a
Product-git-urlsn/a
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2024-7592
Matching Score-4
Assigner-Python Software Foundation
ShareView Details
Matching Score-4
Assigner-Python Software Foundation
CVSS Score-7.5||HIGH
EPSS-0.80% / 74.06%
||
7 Day CHG~0.00%
Published-19 Aug, 2024 | 19:06
Updated-03 Nov, 2025 | 23:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Quadratic complexity parsing cookies with backslashes

There is a LOW severity vulnerability affecting CPython, specifically the 'http.cookies' standard library module. When parsing cookies that contained backslashes for quoted characters in the cookie value, the parser would use an algorithm with quadratic complexity, resulting in excess CPU resources being used while parsing the value.

Action-Not Available
Vendor-Python Software Foundation
Product-pythonCPythoncpython
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CWE ID-CWE-400
Uncontrolled Resource Consumption
CVE-2024-6232
Matching Score-4
Assigner-Python Software Foundation
ShareView Details
Matching Score-4
Assigner-Python Software Foundation
CVSS Score-7.5||HIGH
EPSS-4.02% / 88.54%
||
7 Day CHG+0.38%
Published-03 Sep, 2024 | 12:29
Updated-03 Nov, 2025 | 23:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Regular-expression DoS when parsing TarFile headers

There is a MEDIUM severity vulnerability affecting CPython. Regular expressions that allowed excessive backtracking during tarfile.TarFile header parsing are vulnerable to ReDoS via specifically-crafted tar archives.

Action-Not Available
Vendor-Python Software Foundation
Product-pythonCPythoncpython
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2024-58340
Matching Score-4
Assigner-VulnCheck
ShareView Details
Matching Score-4
Assigner-VulnCheck
CVSS Score-8.7||HIGH
EPSS-0.08% / 24.09%
||
7 Day CHG~0.00%
Published-12 Jan, 2026 | 23:05
Updated-05 Mar, 2026 | 01:29
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
LangChain <= 0.3.1 MRKLOutputParser ReDoS

LangChain versions up to and including 0.3.1 contain a regular expression denial-of-service (ReDoS) vulnerability in the MRKLOutputParser.parse() method (libs/langchain/langchain/agents/mrkl/output_parser.py). The parser applies a backtracking-prone regular expression when extracting tool actions from model output. An attacker who can supply or influence the parsed text (for example via prompt injection in downstream applications that pass LLM output directly into MRKLOutputParser.parse()) can trigger excessive CPU consumption by providing a crafted payload, causing significant parsing delays and a denial-of-service condition.

Action-Not Available
Vendor-langchainLangChain AI
Product-langchainLangChain
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2015-8854
Matching Score-4
Assigner-MITRE Corporation
ShareView Details
Matching Score-4
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-0.89% / 75.66%
||
7 Day CHG~0.00%
Published-23 Jan, 2017 | 21:00
Updated-20 Apr, 2025 | 01:37
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

The marked package before 0.3.4 for Node.js allows attackers to cause a denial of service (CPU consumption) via unspecified vectors that trigger a "catastrophic backtracking issue for the em inline rule," aka a "regular expression denial of service (ReDoS)."

Action-Not Available
Vendor-marked_projectn/aFedora Project
Product-fedoramarkedn/a
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2025-61581
Matching Score-4
Assigner-Apache Software Foundation
ShareView Details
Matching Score-4
Assigner-Apache Software Foundation
CVSS Score-7.5||HIGH
EPSS-0.32% / 54.69%
||
7 Day CHG~0.00%
Published-16 Oct, 2025 | 08:40
Updated-04 Nov, 2025 | 22:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Apache Traffic Control: ReDoS issue in Traffic Router configuration

** UNSUPPORTED WHEN ASSIGNED ** Inefficient Regular Expression Complexity vulnerability in Apache Traffic Control. This issue affects Apache Traffic Control: all versions. People with access to the management interface of the Traffic Router component could specify malicious patterns and cause unavailability. As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Action-Not Available
Vendor-The Apache Software Foundation
Product-traffic_controlApache Traffic Control
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2015-8315
Matching Score-4
Assigner-MITRE Corporation
ShareView Details
Matching Score-4
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-0.85% / 75.07%
||
7 Day CHG~0.00%
Published-23 Jan, 2017 | 21:00
Updated-20 Apr, 2025 | 01:37
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

The ms package before 0.7.1 for Node.js allows attackers to cause a denial of service (CPU consumption) via a long version string, aka a "regular expression denial of service (ReDoS)."

Action-Not Available
Vendor-verceln/avercel
Product-msn/ams
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2019-25102
Matching Score-4
Assigner-VulDB
ShareView Details
Matching Score-4
Assigner-VulDB
CVSS Score-4.3||MEDIUM
EPSS-0.24% / 46.85%
||
7 Day CHG~0.00%
Published-12 Feb, 2023 | 13:31
Updated-05 Aug, 2024 | 03:00
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
simple-markdown simple-markdown.js redos

A vulnerability, which was classified as problematic, was found in simple-markdown 0.6.0. Affected is an unknown function of the file simple-markdown.js. The manipulation with the input <<<<<<<<<<:/:/:/:/:/:/:/:/:/:/ leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 0.6.1 is able to address this issue. The patch is identified as 015a719bf5cdc561feea05500ecb3274ef609cd2. It is recommended to upgrade the affected component. VDB-220638 is the identifier assigned to this vulnerability.

Action-Not Available
Vendor-khanacademyn/a
Product-simple-markdownsimple-markdown
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2026-33671
Matching Score-4
Assigner-GitHub, Inc.
ShareView Details
Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-7.5||HIGH
EPSS-0.02% / 5.41%
||
7 Day CHG~0.00%
Published-26 Mar, 2026 | 21:20
Updated-01 Apr, 2026 | 13:45
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Picomatch has a ReDoS vulnerability via extglob quantifiers

Picomatch is a glob matcher written JavaScript. Versions prior to 4.0.4, 3.0.2, and 2.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) when processing crafted extglob patterns. Certain patterns using extglob quantifiers such as `+()` and `*()`, especially when combined with overlapping alternatives or nested extglobs, are compiled into regular expressions that can exhibit catastrophic backtracking on non-matching input. Applications are impacted when they allow untrusted users to supply glob patterns that are passed to `picomatch` for compilation or matching. In those cases, an attacker can cause excessive CPU consumption and block the Node.js event loop, resulting in a denial of service. Applications that only use trusted, developer-controlled glob patterns are much less likely to be exposed in a security-relevant way. This issue is fixed in picomatch 4.0.4, 3.0.2 and 2.3.2. Users should upgrade to one of these versions or later, depending on their supported release line. If upgrading is not immediately possible, avoid passing untrusted glob patterns to `picomatch`. Possible mitigations include disabling extglob support for untrusted patterns by using `noextglob: true`, rejecting or sanitizing patterns containing nested extglobs or extglob quantifiers such as `+()` and `*()`, enforcing strict allowlists for accepted pattern syntax, running matching in an isolated worker or separate process with time and resource limits, and applying application-level request throttling and input validation for any endpoint that accepts glob patterns.

Action-Not Available
Vendor-jonschlinkertmicromatch
Product-picomatchpicomatch
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2024-5552
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
ShareView Details
Matching Score-4
Assigner-Protect AI (formerly huntr.dev)
CVSS Score-7.5||HIGH
EPSS-0.42% / 61.73%
||
7 Day CHG~0.00%
Published-06 Jun, 2024 | 18:09
Updated-23 Sep, 2024 | 22:31
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
ReDoS in kubeflow/kubeflow

kubeflow/kubeflow is vulnerable to a Regular Expression Denial of Service (ReDoS) attack due to inefficient regular expression complexity in its email validation mechanism. An attacker can remotely exploit this vulnerability without authentication by providing specially crafted input that causes the application to consume an excessive amount of CPU resources. This vulnerability affects the latest version of kubeflow/kubeflow, specifically within the centraldashboard-angular backend component. The impact of exploiting this vulnerability includes resource exhaustion, and service disruption.

Action-Not Available
Vendor-kubeflowkubeflowkubeflow
Product-kubeflowkubeflow/kubeflowkubeflow
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2023-45813
Matching Score-4
Assigner-GitHub, Inc.
ShareView Details
Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-4.6||MEDIUM
EPSS-0.77% / 73.58%
||
7 Day CHG~0.00%
Published-18 Oct, 2023 | 20:26
Updated-13 Sep, 2024 | 14:39
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Inefficient Regular Expression Complexity in TorBot

Torbot is an open source tor network intelligence tool. In affected versions the `torbot.modules.validators.validate_link function` uses the python-validators URL validation regex. This particular regular expression has an exponential complexity which allows an attacker to cause an application crash using a well-crafted argument. An attacker can use a well-crafted URL argument to exploit the vulnerability in the regular expression and cause a Denial of Service on the system. The validators file has been removed in version 4.0.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Action-Not Available
Vendor-validators_projecttorbot_projectDedSecInside
Product-torbotvalidatorsTorBot
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2025-5897
Matching Score-4
Assigner-VulDB
ShareView Details
Matching Score-4
Assigner-VulDB
CVSS Score-5.3||MEDIUM
EPSS-0.64% / 70.51%
||
7 Day CHG~0.00%
Published-09 Jun, 2025 | 21:00
Updated-10 Jul, 2025 | 16:28
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
vuejs vue-cli Markdown Code HtmlPwaPlugin.js HtmlPwaPlugin redos

A vulnerability was found in vuejs vue-cli up to 5.0.8. It has been rated as problematic. This issue affects the function HtmlPwaPlugin of the file packages/@vue/cli-plugin-pwa/lib/HtmlPwaPlugin.js of the component Markdown Code Handler. The manipulation leads to inefficient regular expression complexity. The attack may be initiated remotely.

Action-Not Available
Vendor-vuejsvuejs
Product-vue_clivue-cli
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CWE ID-CWE-400
Uncontrolled Resource Consumption
CVE-2023-4316
Matching Score-4
Assigner-Fluid Attacks
ShareView Details
Matching Score-4
Assigner-Fluid Attacks
CVSS Score-7.5||HIGH
EPSS-0.14% / 34.17%
||
7 Day CHG~0.00%
Published-28 Sep, 2023 | 20:34
Updated-03 Dec, 2025 | 20:17
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Zod 3.22.2 - Regular expression Denial of Service

Zod in versions 3.21.0 up to and including 3.22.3 allows an attacker to perform a denial of service while validating emails.

Action-Not Available
Vendor-zodZod
Product-zodZod
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CVE-2025-5895
Matching Score-4
Assigner-VulDB
ShareView Details
Matching Score-4
Assigner-VulDB
CVSS Score-5.3||MEDIUM
EPSS-0.53% / 67.21%
||
7 Day CHG~0.00%
Published-09 Jun, 2025 | 20:00
Updated-10 Jul, 2025 | 16:26
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Metabase dom.js parseDataUri redos

A vulnerability was found in Metabase 54.10. It has been classified as problematic. This affects the function parseDataUri of the file frontend/src/metabase/lib/dom.js. The manipulation leads to inefficient regular expression complexity. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The patch is named 4454ebbdc7719016bf80ca0f34859ce5cee9f6b0. It is recommended to apply a patch to fix this issue.

Action-Not Available
Vendor-metabasen/a
Product-metabaseMetabase
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CWE ID-CWE-400
Uncontrolled Resource Consumption
CVE-2025-5892
Matching Score-4
Assigner-VulDB
ShareView Details
Matching Score-4
Assigner-VulDB
CVSS Score-5.3||MEDIUM
EPSS-0.67% / 71.49%
||
7 Day CHG~0.00%
Published-09 Jun, 2025 | 19:31
Updated-10 Jul, 2025 | 16:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
RocketChat parseMessage.js parseMessage redos

A vulnerability, which was classified as problematic, has been found in RocketChat up to 7.6.1. This issue affects the function parseMessage of the file /apps/meteor/app/irc/server/servers/RFC2813/parseMessage.js. The manipulation of the argument line leads to inefficient regular expression complexity. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Action-Not Available
Vendor-rocket.chatn/a
Product-rocket.chatRocketChat
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CWE ID-CWE-400
Uncontrolled Resource Consumption
CVE-2025-5896
Matching Score-4
Assigner-VulDB
ShareView Details
Matching Score-4
Assigner-VulDB
CVSS Score-5.3||MEDIUM
EPSS-0.74% / 73.06%
||
7 Day CHG~0.00%
Published-09 Jun, 2025 | 20:31
Updated-10 Jul, 2025 | 16:27
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
tarojs taro index.js redos

A vulnerability was found in tarojs taro up to 4.1.1. It has been declared as problematic. This vulnerability affects unknown code of the file taro/packages/css-to-react-native/src/index.js. The manipulation leads to inefficient regular expression complexity. The attack can be initiated remotely. Upgrading to version 4.1.2 is able to address this issue. The name of the patch is c2e321a8b6fc873427c466c69f41ed0b5e8814bf. It is recommended to upgrade the affected component.

Action-Not Available
Vendor-tarotarojs
Product-tarotaro
CWE ID-CWE-1333
Inefficient Regular Expression Complexity
CWE ID-CWE-400
Uncontrolled Resource Consumption
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