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Vulnerability Details :

CVE-2026-25521

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-04 Feb, 2026 | 21:20
Updated At-05 Feb, 2026 | 14:31
Rejected At-
Credits

Locutus is vulnerable to Prototype Pollution

Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype. This issue has been patched in version 2.0.39.

Vendors
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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)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:04 Feb, 2026 | 21:20
Updated At:05 Feb, 2026 | 14:31
Rejected At:
▼CVE Numbering Authority (CNA)
Locutus is vulnerable to Prototype Pollution

Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype. This issue has been patched in version 2.0.39.

Affected Products
Vendor
locutusjs
Product
locutus
Versions
Affected
  • >= 2.0.12, < 2.0.39
Problem Types
TypeCWE IDDescription
CWECWE-1321CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Type: CWE
CWE ID: CWE-1321
Description: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Metrics
VersionBase scoreBase severityVector
4.09.4CRITICAL
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Version: 4.0
Base score: 9.4
Base severity: CRITICAL
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh
x_refsource_CONFIRM
https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c
x_refsource_MISC
Hyperlink: https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c
Resource:
x_refsource_MISC
▼Authorized 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
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:04 Feb, 2026 | 22:15
Updated At:20 Feb, 2026 | 21:20

Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype. This issue has been patched in version 2.0.39.

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
Secondary4.09.4CRITICAL
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Primary3.18.8HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Type: Secondary
Version: 4.0
Base score: 9.4
Base severity: CRITICAL
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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: 8.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CPE Matches

locutus
locutus
>>locutus>>Versions from 2.0.12(inclusive) to 2.0.39(exclusive)
cpe:2.3:a:locutus:locutus:*:*:*:*:*:node.js:*:*
Weaknesses
CWE IDTypeSource
CWE-1321Primarysecurity-advisories@github.com
CWE ID: CWE-1321
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01csecurity-advisories@github.com
Patch
https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mhsecurity-advisories@github.com
Exploit
Vendor Advisory
Hyperlink: https://github.com/locutusjs/locutus/commit/042af9ca7fde2ff599120783e720a17f335bb01c
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/locutusjs/locutus/security/advisories/GHSA-rxrv-835q-v5mh
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory

Change History

0
Information is not available yet

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