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Vulnerability Details :

CVE-2026-47066

Summary
Assigner-EEF
Assigner Org ID-6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published At-25 May, 2026 | 14:00
Updated At-27 May, 2026 | 15:40
Rejected At-
Credits

Infinite loop in Alt-Svc header parser in hackney

Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in benoitc hackney allows Excessive Allocation. The Alt-Svc response header parser in src/hackney_altsvc.erl does not guarantee forward progress. When parse_token/2 receives a non-token, non-whitespace, non-comma byte (e.g. !, @, =, ;), it returns the input unchanged. skip_comma/1 also returns the buffer unchanged when the first byte is not a comma. parse_entries/2 then recurses with identical data, creating a tight infinite tail-recursive loop that pins a scheduler at 100% CPU. The calling process never returns. The entry point parse_and_cache/3 is called synchronously in the connection process on every HTTP response. A single-byte Alt-Svc: ! response header is sufficient to trigger the hang; the header is fully controlled by any HTTP origin the client connects to. This issue affects hackney: from 2.0.0-beta.1 before 4.0.1.

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:EEF
Assigner Org ID:6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published At:25 May, 2026 | 14:00
Updated At:27 May, 2026 | 15:40
Rejected At:
â–¼CVE Numbering Authority (CNA)
Infinite loop in Alt-Svc header parser in hackney

Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in benoitc hackney allows Excessive Allocation. The Alt-Svc response header parser in src/hackney_altsvc.erl does not guarantee forward progress. When parse_token/2 receives a non-token, non-whitespace, non-comma byte (e.g. !, @, =, ;), it returns the input unchanged. skip_comma/1 also returns the buffer unchanged when the first byte is not a comma. parse_entries/2 then recurses with identical data, creating a tight infinite tail-recursive loop that pins a scheduler at 100% CPU. The calling process never returns. The entry point parse_and_cache/3 is called synchronously in the connection process on every HTTP response. A single-byte Alt-Svc: ! response header is sufficient to trigger the hang; the header is fully controlled by any HTTP origin the client connects to. This issue affects hackney: from 2.0.0-beta.1 before 4.0.1.

Affected Products
Vendor
benoitc
Product
hackney
Collection URL
https://repo.hex.pm
Package Name
hackney
Repo
https://github.com/benoitc/hackney
CPEs
  • cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*
Modules
  • hackney_altsvc
Program Files
  • src/hackney_altsvc.erl
Program Routines
  • hackney_altsvc:parse_entries/2
  • hackney_altsvc:parse_entry/1
  • hackney_altsvc:parse_protocol/1
  • hackney_altsvc:parse_token/2
  • hackney_altsvc:skip_comma/1
Default Status
unaffected
Versions
Affected
  • From 2.0.0-beta.1 before 4.0.1 (semver)
Vendor
benoitc
Product
hackney
Collection URL
https://github.com
Package Name
benoitc/hackney
Repo
https://github.com/benoitc/hackney
CPEs
  • cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*
Modules
  • hackney_altsvc
Program Files
  • src/hackney_altsvc.erl
Program Routines
  • hackney_altsvc:parse_entries/2
  • hackney_altsvc:parse_entry/1
  • hackney_altsvc:parse_protocol/1
  • hackney_altsvc:parse_token/2
  • hackney_altsvc:skip_comma/1
Default Status
unaffected
Versions
Affected
  • From 408e5fe20302226ea8c74dde2bcbd452d712b5b2 before e548aba1f97ffa3f4750da7b772998fb78c01894 (git)
Problem Types
TypeCWE IDDescription
CWECWE-835CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
Type: CWE
CWE ID: CWE-835
Description: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
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
CAPEC-130CAPEC-130 Excessive Allocation
CAPEC ID: CAPEC-130
Description: CAPEC-130 Excessive Allocation
Solutions

Configurations

Workarounds

Exploits

Credits

finder
Peter Ullrich
remediation developer
Benoit Chesneau
analyst
Jonatan Männchen / EEF
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j
vendor-advisory
related
https://cna.erlef.org/cves/CVE-2026-47066.html
related
https://osv.dev/vulnerability/EEF-CVE-2026-47066
related
https://github.com/benoitc/hackney/commit/e548aba1f97ffa3f4750da7b772998fb78c01894
patch
Hyperlink: https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j
Resource:
vendor-advisory
related
Hyperlink: https://cna.erlef.org/cves/CVE-2026-47066.html
Resource:
related
Hyperlink: https://osv.dev/vulnerability/EEF-CVE-2026-47066
Resource:
related
Hyperlink: https://github.com/benoitc/hackney/commit/e548aba1f97ffa3f4750da7b772998fb78c01894
Resource:
patch
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/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j
exploit
Hyperlink: https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j
Resource:
exploit
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published At:25 May, 2026 | 15:16
Updated At:27 May, 2026 | 13:54

Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in benoitc hackney allows Excessive Allocation. The Alt-Svc response header parser in src/hackney_altsvc.erl does not guarantee forward progress. When parse_token/2 receives a non-token, non-whitespace, non-comma byte (e.g. !, @, =, ;), it returns the input unchanged. skip_comma/1 also returns the buffer unchanged when the first byte is not a comma. parse_entries/2 then recurses with identical data, creating a tight infinite tail-recursive loop that pins a scheduler at 100% CPU. The calling process never returns. The entry point parse_and_cache/3 is called synchronously in the connection process on every HTTP response. A single-byte Alt-Svc: ! response header is sufficient to trigger the hang; the header is fully controlled by any HTTP origin the client connects to. This issue affects hackney: from 2.0.0-beta.1 before 4.0.1.

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

benoitc
benoitc
>>hackney>>Versions from 2.0.0(inclusive) to 4.0.1(exclusive)
cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-835Secondary6b3ad84c-e1a6-4bf7-a703-f496b71e49db
CWE ID: CWE-835
Type: Secondary
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://cna.erlef.org/cves/CVE-2026-47066.html6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Third Party Advisory
Patch
https://github.com/benoitc/hackney/commit/e548aba1f97ffa3f4750da7b772998fb78c018946b3ad84c-e1a6-4bf7-a703-f496b71e49db
Patch
https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Exploit
Vendor Advisory
Patch
https://osv.dev/vulnerability/EEF-CVE-2026-470666b3ad84c-e1a6-4bf7-a703-f496b71e49db
Third Party Advisory
Patch
https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Vendor Advisory
Patch
Hyperlink: https://cna.erlef.org/cves/CVE-2026-47066.html
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Resource:
Third Party Advisory
Patch
Hyperlink: https://github.com/benoitc/hackney/commit/e548aba1f97ffa3f4750da7b772998fb78c01894
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Resource:
Patch
Hyperlink: https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Resource:
Exploit
Vendor Advisory
Patch
Hyperlink: https://osv.dev/vulnerability/EEF-CVE-2026-47066
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Resource:
Third Party Advisory
Patch
Hyperlink: https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Vendor Advisory
Patch

Change History

0
Information is not available yet

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KEV Action Due Date-Not Available
Infinite loop triggered by connection ID retirement

Cloudflare quiche was discovered to be vulnerable to an infinite loop when sending packets containing RETIRE_CONNECTION_ID frames. QUIC connections possess a set of connection identifiers (IDs); see Section 5.1 of RFC 9000 https://datatracker.ietf.org/doc/html/rfc9000#section-5.1 . Once the QUIC handshake completes, a local endpoint is responsible for issuing and retiring Connection IDs that are used by the remote peer to populate the Destination Connection ID field in packets sent from remote to local. Each Connection ID has a sequence number to ensure synchronization between peers. An unauthenticated remote attacker can exploit this vulnerability by first completing a handshake and then sending a specially-crafted set of frames that trigger a connection ID retirement in the victim. When the victim attempts to send a packet containing RETIRE_CONNECTION_ID frames, Section 19.16 of RFC 9000 https://datatracker.ietf.org/doc/html/rfc9000#section-19.6 requires that the sequence number of the retired connection ID must not be the same as the sequence number of the connection ID used by the packet. In other words, a packet cannot contain a frame that retires itself. In scenarios such as path migration, it is possible for there to be multiple active paths with different active connection IDs that could be used to retire each other. The exploit triggered an unintentional behaviour of a quiche design feature that supports retirement across paths while maintaining full connection ID synchronization, leading to an infinite loop.This issue affects quiche: from 0.15.0 before 0.24.5.

Action-Not Available
Vendor-Cloudflare, Inc.
Product-quichequiche
CWE ID-CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
CVE-2023-38197
Matching Score-4
Assigner-MITRE Corporation
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Matching Score-4
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-0.05% / 16.15%
||
7 Day CHG~0.00%
Published-13 Jul, 2023 | 00:00
Updated-02 Aug, 2024 | 17:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

An issue was discovered in Qt before 5.15.15, 6.x before 6.2.10, and 6.3.x through 6.5.x before 6.5.3. There are infinite loops in recursive entity expansion.

Action-Not Available
Vendor-qtn/aqtFedora Project
Product-qtn/aqtfedora
CWE ID-CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
CVE-2023-35933
Matching Score-4
Assigner-GitHub, Inc.
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Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-5.9||MEDIUM
EPSS-0.40% / 60.60%
||
7 Day CHG~0.00%
Published-26 Jun, 2023 | 19:26
Updated-03 Dec, 2024 | 18:41
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
OpenFGA denial of service die to circular relationship

OPenFGA is an open source authorization/permission engine built for developers. OpenFGA versions v1.1.0 and prior are vulnerable to a DoS attack when Check and ListObjects calls are executed against authorization models that contain circular relationship definitions. Users are affected by this vulnerability if they are using OpenFGA v1.1.0 or earlier, and if you are executing `Check` or `ListObjects` calls against a vulnerable authorization model. Users are advised to upgrade to version 1.1.1. There are no known workarounds for this vulnerability. Users that do not have circular relationships in their models are not affected.

Action-Not Available
Vendor-openfgaopenfga
Product-openfgaopenfga
CWE ID-CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
CVE-2023-34966
Matching Score-4
Assigner-Red Hat, Inc.
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Matching Score-4
Assigner-Red Hat, Inc.
CVSS Score-7.5||HIGH
EPSS-14.31% / 94.51%
||
7 Day CHG~0.00%
Published-20 Jul, 2023 | 14:56
Updated-20 Nov, 2025 | 17:28
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Samba: infinite loop in mdssvc rpc service for spotlight

An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition.

Action-Not Available
Vendor-Red Hat, Inc.Fedora ProjectDebian GNU/LinuxSamba
Product-sambadebian_linuxfedoraenterprise_linuxRed Hat Enterprise Linux 8.8 Extended Update SupportRed Hat Virtualization 4 for Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9Red Hat Enterprise Linux 8.6 Extended Update SupportRed Hat Storage 3Red Hat Enterprise Linux 7Red Hat Enterprise Linux 6Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat Enterprise Linux 8
CWE ID-CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
CVE-2017-16932
Matching Score-4
Assigner-MITRE Corporation
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Matching Score-4
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-21.75% / 95.84%
||
7 Day CHG-0.23%
Published-23 Nov, 2017 | 21:00
Updated-13 May, 2026 | 00:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

parser.c in libxml2 before 2.9.5 does not prevent infinite recursion in parameter entities.

Action-Not Available
Vendor-n/alibxml2 (XMLSoft)
Product-libxml2n/a
CWE ID-CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
CVE-2017-9023
Matching Score-4
Assigner-MITRE Corporation
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Matching Score-4
Assigner-MITRE Corporation
CVSS Score-7.5||HIGH
EPSS-2.10% / 84.34%
||
7 Day CHG+0.85%
Published-08 Jun, 2017 | 16:00
Updated-13 May, 2026 | 00:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

The ASN.1 parser in strongSwan before 5.5.3 improperly handles CHOICE types when the x509 plugin is enabled, which allows remote attackers to cause a denial of service (infinite loop) via a crafted certificate.

Action-Not Available
Vendor-strongswann/a
Product-strongswann/a
CWE ID-CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
CVE-2017-2909
Matching Score-4
Assigner-Talos
ShareView Details
Matching Score-4
Assigner-Talos
CVSS Score-7.5||HIGH
EPSS-0.37% / 58.98%
||
7 Day CHG~0.00%
Published-07 Nov, 2017 | 16:00
Updated-13 May, 2026 | 00:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

An infinite loop programming error exists in the DNS server functionality of Cesanta Mongoose 6.8 library. A specially crafted DNS request can cause an infinite loop resulting in high CPU usage and Denial Of Service. An attacker can send a packet over the network to trigger this vulnerability.

Action-Not Available
Vendor-cesantaCesanta
Product-mongooseMongoose
CWE ID-CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
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