{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-111758","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-10-16T17:52:09.081Z","datePublished":"2026-10-20T20:28:40.677Z","dateUpdated":"2026-10-28T16:40:33.483Z"},"containers":{"cna":{"title":"markdown-it: Quadratic-time rendering of a single multi-line link reference definition with default options (regression since 14.0)","problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"CWE-407: Inefficient Algorithmic Complexity","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c","tags":["x_refsource_CONFIRM"],"url":"https://github.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c"},{"name":"https://github.com/markdown-it/markdown-it/commit/48fbc465812c440020c663f040ab22deaf8f1eca","tags":["x_refsource_MISC"],"url":"https://github.com/markdown-it/markdown-it/commit/48fbc465812c440020c663f040ab22deaf8f1eca"},{"name":"https://github.com/markdown-it/markdown-it/commit/d99f48839d37af6fd8a2617516c43dab90755503","tags":["x_refsource_MISC"],"url":"https://github.com/markdown-it/markdown-it/commit/d99f48839d37af6fd8a2617516c43dab90755503"},{"name":"https://github.com/markdown-it/markdown-it/releases/tag/14.3.3","tags":["x_refsource_MISC"],"url":"https://github.com/markdown-it/markdown-it/releases/tag/14.3.3"},{"name":"https://github.com/markdown-it/markdown-it/releases/tag/15.0.3","tags":["x_refsource_MISC"],"url":"https://github.com/markdown-it/markdown-it/releases/tag/15.0.3"}],"affected":[{"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"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-10-20T20:28:40.677Z"},"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."}],"source":{"advisory":"GHSA-gfr2-rv44-r23c","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-28T16:39:57.942731Z","id":"CVE-2026-111758","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-28T16:40:33.483Z"}}]}}