{"id":"CVE-2026-103043","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-103043","generatedAt":"2026-10-28T01:12:31.015Z","title":"anchorme through 3.0.8 contains a regular expression denial of service vulnerability in the IPv6 host extraction regex due to catastrophic backtracking.","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.","published":"2026-09-29T23:17:22.000Z","lastModified":"2026-10-20T02:17:09.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":8.7,"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/M"},"cwe":["CWE-1333"],"affected":[],"epss":{"score":0.00589,"percentile":0.47871,"date":"2026-10-26","history":[{"date":"2026-09-30","score":0.00446,"percentile":0.3644}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.59%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T23:17:22.000Z","detail":{"score":"8.7","severity":"HIGH","publishedAt":"2026-09-29T23:17:22.023Z"},"summary":"New CVE, high severity (CVSS 8.7)."}],"references":[{"url":"https://gist.github.com/R3tro16/92948206e9893a3739b91746439384ab","source":"disclosure@vulncheck.com"},{"url":"https://gist.github.com/mmadersbacher/46050b4224eb979431986cdef1dd2ad3","source":"disclosure@vulncheck.com"},{"url":"https://github.com/alexcorvi/anchorme.js","source":"disclosure@vulncheck.com"},{"url":"https://github.com/alexcorvi/anchorme.js/blob/f3ae9850baa344f27b46bb149e9b891831d273b1/src/index.ts#L109","source":"disclosure@vulncheck.com"},{"url":"https://www.npmjs.com/package/anchorme","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/anchorme-through-3.0.8-regular-expression-denial-of-service","source":"disclosure@vulncheck.com"},{"url":"https://gist.github.com/mmadersbacher/46050b4224eb979431986cdef1dd2ad3","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-103043","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}