{"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": "2026-10-20T20:28:40.677Z"}, "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(n\u00b2) 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"}}}}

{}

{"affected": [{"affectedData": [{"product": "markdown-it", "vendor": "markdown-it", "versions": [{"status": "affected", "version": ">= 14.1.0, < 14.3.3"}, {"status": "affected", "version": ">= 15.0.0, < 15.0.3"}]}], "source": "security-advisories@github.com"}], "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(n\u00b2) 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."}], "id": "CVE-2026-111758", "lastModified": "2026-10-20T21:17:17.110", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-20T21:17:17.110", "references": [{"source": "security-advisories@github.com", "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"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-407"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-10-20T22:00:16.072354+00:00", "updated": "2026-10-20T22:00:16.072359+00:00", "vendors": []}