{"id":"DEBIAN-CVE-2026-118694","details":"python-markdown2 through 2.5.5 contains a denial of service vulnerability that allows remote users to exhaust CPU by submitting Markdown with unclosed inline link destinations. Attackers can submit repeated '[a](' or '![a](' sequences, causing _find_balanced to rescan the remaining document for each link and consume quadratic CPU time.","modified":"2026-10-30T10:00:24.008864434Z","published":"2026-10-28T22:17:13.700Z","upstream":["CVE-2026-118694"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-118694"}],"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-2026-118694.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-2026-118694.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-2026-118694.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}