anchorme through 3.0.8 contains a regular expression denial of service vulnerability in the IPv6 host extraction regex due to catastrophic backtracking. Attackers can supply specially crafted input strings with repeated patterns to cause exponential regex engine backtracking, blocking the Node.js event loop and denying service to other requests.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00446.

Exploitation poc

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
alexcorvi anchorme unaffected
Version Status Constraints
0 affected ≤ 3.0.8

No data.

No data.

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Vendors Products
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Anchorme Project Subscribe
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Project Subscriptions

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Anchorme Project Subscribe
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://gist.github.com/mmadersbacher/46050b4224eb979431986cdef1dd2ad3 cve-icon cve-icon cve-icon
https://github.com/alexcorvi/anchorme.js cve-icon cve-icon
https://github.com/alexcorvi/anchorme.js/blob/f3ae9850baa344f27b46bb149e9b891831d273b1/src/index.ts#L109 cve-icon cve-icon
https://www.npmjs.com/package/anchorme cve-icon cve-icon
https://www.vulncheck.com/advisories/anchorme-through-3.0.8-regular-expression-denial-of-service cve-icon cve-icon
History

Wed, 30 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Alexcorvi
Alexcorvi anchorme
Vendors & Products Alexcorvi
Alexcorvi anchorme

Wed, 30 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 29 Sep 2026 23:00:00 +0000

Type Values Removed Values Added
Description anchorme through 3.0.8 contains a regular expression denial of service vulnerability in the IPv6 host extraction regex due to catastrophic backtracking. Attackers can supply specially crafted input strings with repeated patterns to cause exponential regex engine backtracking, blocking the Node.js event loop and denying service to other requests.
Title anchorme through 3.0.8 Regular Expression Denial of Service
First Time appeared Anchorme Project
Anchorme Project anchorme
Weaknesses CWE-1333
CPEs cpe:2.3:a:anchorme_project:anchorme:*:*:*:*:*:*:*:*
Vendors & Products Anchorme Project
Anchorme Project anchorme
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-30T19:15:10.494Z

Reserved: 2026-09-29T22:17:06.983Z

Link: CVE-2026-103043

cve-icon Vulnrichment

Updated: 2026-09-30T19:14:53.642Z

cve-icon NVD

Status : Deferred

Published: 2026-09-29T23:17:22.023

Modified: 2026-09-30T20:17:28.487

Link: CVE-2026-103043

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T20:34:55Z

Weaknesses