{"id":"DEBIAN-CVE-2026-111766","details":"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.","modified":"2026-10-20T15:00:06.440559136Z","published":"2026-10-20T14:47:31.014893248Z","upstream":["CVE-2026-111766"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-111766"}],"affected":[{"package":{"name":"node-markdown-it","ecosystem":"Debian:12","purl":"pkg:deb/debian/node-markdown-it?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["22.2.3+dfsg+~12.2.3-2","22.2.3+dfsg+~12.2.3-3","22.2.3+dfsg+~12.2.3-4","22.2.3+dfsg+~12.2.3-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-111766.json"}},{"package":{"name":"node-markdown-it","ecosystem":"Debian:13","purl":"pkg:deb/debian/node-markdown-it?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["22.2.3+dfsg+~12.2.3-2","22.2.3+dfsg+~12.2.3-3","22.2.3+dfsg+~12.2.3-4","22.2.3+dfsg+~12.2.3-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-111766.json"}},{"package":{"name":"node-markdown-it","ecosystem":"Debian:14","purl":"pkg:deb/debian/node-markdown-it?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["22.2.3+dfsg+~12.2.3-2","22.2.3+dfsg+~12.2.3-3","22.2.3+dfsg+~12.2.3-4","22.2.3+dfsg+~12.2.3-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-111766.json"}}],"schema_version":"1.9.0"}