CVE-2026-103043: alexcorvi anchorme · ReDoS
Affects alexcorvi anchormeSource CVE Database V5
Not known to be exploited · CVSS 8.7 High.
Data as of 13 Nov 2026, 23:53 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 29 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| alexcorvianchorme | Affected
| Fixed in– |
npmanchormepkg:npm/anchormeOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Users should monitor the vendor advisory for updates and consider avoiding or limiting use of the IPv6 host extraction feature in anchorme until a fix is released.
Description
anchorme versions up to 3.0.8 contain a regular expression denial of service (ReDoS) vulnerability in the IPv6 host extraction regex. This vulnerability arises from catastrophic backtracking in the regex engine when processing specially crafted input strings, which can block the Node.js event loop and cause denial of service.
References
- gist.github.com/mmadersbacher/46050b4224eb979431986cdef1dd2ad3 (opens in a new tab)
- github.com/alexcorvi/anchorme.js/blob/f3ae9850baa344f27b46bb149e9b891831d273b1/src/index.ts (opens in a new tab)
- npmjs.com/package/anchorme (opens in a new tab)
- github.com/alexcorvi/anchorme.js (opens in a new tab)
- vulncheck.com/advisories/anchorme-through-3.0.8-regular-expression-denial-of-service (opens in a new tab)
- gist.github.com/R3tro16/92948206e9893a3739b91746439384ab (opens in a new tab)