{"id":"CVE-2026-111758","sourceIdentifier":"security-advisories@github.com","published":"2026-10-20T21:17:17.110","lastModified":"2026-10-28T17:17:39.977","vulnStatus":"Awaiting Analysis","cveTags":[],"descriptions":[{"lang":"en","value":"markdown-it is a Markdown parser. From versions 14.1.0 to before 14.3.3, and 15.0.0 to before 15.0.3, a link reference definition whose label or title is never closed is O(n²) with default options. Continuation lines are pulled lazily with str += lineContent in src/rules_block/reference.ts, and the subsequent charCodeAt and slice calls flatten the V8 cons-string, copying everything collected so far; this runs before the rule decides the definition is invalid. No options are required to trigger it. This issue has been patched in versions 14.3.3 and 15.0.3."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"markdown-it","product":"markdown-it","versions":[{"version":">= 14.1.0, < 14.3.3","status":"affected"},{"version":">= 15.0.0, < 15.0.3","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-28T16:39:57.942731Z","id":"CVE-2026-111758","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-400"},{"lang":"en","value":"CWE-407"}]}],"references":[{"url":"https://github.com/markdown-it/markdown-it/commit/48fbc465812c440020c663f040ab22deaf8f1eca","source":"security-advisories@github.com"},{"url":"https://github.com/markdown-it/markdown-it/commit/d99f48839d37af6fd8a2617516c43dab90755503","source":"security-advisories@github.com"},{"url":"https://github.com/markdown-it/markdown-it/releases/tag/14.3.3","source":"security-advisories@github.com"},{"url":"https://github.com/markdown-it/markdown-it/releases/tag/15.0.3","source":"security-advisories@github.com"},{"url":"https://github.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c","source":"security-advisories@github.com"},{"url":"https://github.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}