CVE-2026-103043
anchorme through 3.0.8 Regular Expression Denial of Service
alexcorvi anchorme
CVSS
8.7HighExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 30 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.48%Chance of exploitation activity in the next 30 days, higher than 40% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- anchormeaffected: all versions through 3.0.8CVE List
References 6
- vulncheck.com/advisories/anchorme-through-3.0.8-regular-expression-denial-of-serviceAdvisoryvia CVE List
- gist.github.com/mmadersbacher/46050b4224eb979431986cdef1dd2ad3Exploitvia CVE List
- gist.github.com/R3tro16/92948206e9893a3739b91746439384abExploitvia CVE List
- github.com/alexcorvi/anchorme.js/blob/f3ae9850baa344f27b46bb149e9b891831d273b1/src/index.ts#L109Referencevia CVE List
- npmjs.com/package/anchormeReferencevia CVE List
- github.com/alexcorvi/anchorme.jsReferencevia CVE List