{"id":"DEBIAN-CVE-2026-88753","details":"A Regular-Expression Denial of Service (ReDoS) in the Markdown2. extract_metadata() function (lib/markdown2.py) of trentm markdown2 through v2.5.5 allows attackers to cause a Denial of Service (DoS) via a crafted Markdown document.","modified":"2026-10-16T07:00:08.935424089Z","published":"2026-10-15T16:18:22.887Z","upstream":["CVE-2026-88753"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-88753"}],"affected":[{"package":{"name":"python-markdown2","ecosystem":"Debian:12","purl":"pkg:deb/debian/python-markdown2?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.1-1","2.4.11-1","2.5.3-1~exp1","2.5.4-1","2.5.4-2","2.5.4-3","2.5.4-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88753.json"}},{"package":{"name":"python-markdown2","ecosystem":"Debian:13","purl":"pkg:deb/debian/python-markdown2?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.11-1","2.5.3-1~exp1","2.5.4-1","2.5.4-2","2.5.4-3","2.5.4-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88753.json"}},{"package":{"name":"python-markdown2","ecosystem":"Debian:14","purl":"pkg:deb/debian/python-markdown2?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.11-1","2.5.3-1~exp1","2.5.4-1","2.5.4-2","2.5.4-3","2.5.4-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88753.json"}}],"schema_version":"1.9.0"}