{"id":"CVE-2026-111766","revision":"33ecd594107045469922527adcc8abb5","records":[{"revision":"33ecd594107045469922527adcc8abb5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-111766","aliases":[],"title":"markdown-it: Quadratic-time denial of service in inline HTML parsing with html enabled","description":"markdown-it is a Markdown parser. Prior to 14.3.3 and 15.0.3, when the html option or commonmark preset is enabled and the constructs occur inside a paragraph, attacker-controlled Markdown containing repeated unterminated inline HTML comments, processing instructions, declarations, or CDATA sections reaches src/rules_inline/html_inline.ts. Its HTML_TAG_RE match searches the remaining suffix for the appropriate terminator; when no terminator is present, parsing advances to the next opener and repeats the match over overlapping input, causing quadratic processing and denial of service through event-loop blocking or an unresponsive browser main thread. HTML blocks and the default HTML-disabled configuration are not affected by these payloads. This issue is fixed in versions 14.3.3 and 15.0.3.","state":0,"publishedAt":"2026-10-19T19:47:46.488+00:00","modifiedAt":"2026-10-19T19:47:46.488+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\": \">= 15.0.0, < 15.0.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"< 14.3.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7,"severity":"LOW"}],"references":["https://github.com/markdown-it/markdown-it/security/advisories/GHSA-vfgh-jcmw-g37q","https://github.com/markdown-it/markdown-it/commit/928bc8c11ded60181c0e7fc5aa954eec582e8e79","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-2026-111766","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-111766","identifiers":["CVE-2026-111766"]},"retained":false,"historicalAffected":[]}],"coverage":[]}