CVE-2026-103043
anchorme through 3.0.8 Regular Expression Denial of Service
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1333 |
| Vendor | alexcorvi |
| Product | anchorme |
| Published | Sep 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
alexcorvi / anchorme
0 ≤ 3.0.8
References
gist.github.com: https://gist.github.com/mmadersbacher/46050b4224eb979431986cdef1dd2ad3 github.com: https://github.com/alexcorvi/anchorme.js/blob/f3ae9850baa344f27b46bb149e9b891831d273b1/src/index.ts#L109 npmjs.com: https://www.npmjs.com/package/anchorme github.com: https://github.com/alexcorvi/anchorme.js vulncheck.com: https://www.vulncheck.com/advisories/anchorme-through-3.0.8-regular-expression-denial-of-service
Credits
Mario Madersbacher