{"id":"CVE-2026-111758","revision":"4eb24487a3924082b65552d9fbbd7ad3","records":[{"revision":"4eb24487a3924082b65552d9fbbd7ad3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-111758","aliases":[],"title":"markdown-it: Quadratic-time rendering of a single multi-line link reference definition with default options (regression since 14.0)","description":"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.","state":0,"publishedAt":"2026-10-20T20:28:40.677+00:00","modifiedAt":"2026-10-20T20:28:40.677+00:00","affected":[{"ecosystem":"Vendor product","name":"markdown-it","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"markdown-it\",\n                    \"product\": \"markdown-it\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 14.1.0, < 14.3.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 15.0.0, < 15.0.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c","https://github.com/markdown-it/markdown-it/commit/48fbc465812c440020c663f040ab22deaf8f1eca","https://github.com/markdown-it/markdown-it/commit/d99f48839d37af6fd8a2617516c43dab90755503","https://github.com/markdown-it/markdown-it/releases/tag/14.3.3","https://github.com/markdown-it/markdown-it/releases/tag/15.0.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111758","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-111758","identifiers":["CVE-2026-111758"]},"retained":false,"historicalAffected":[]}],"coverage":[]}