{"id":"CVE-2026-118694","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-118694","summary":"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…","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.","published":"2026-10-28T22:17:13.700","modified":"2026-10-28T22:17:13.700","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/trentm/python-markdown2/pull/751","label":"trentm/python-markdown2#751"},"references":[{"type":"WEB","url":"https://github.com/trentm/python-markdown2"},{"type":"WEB","url":"https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492"},{"type":"WEB","url":"https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029"},{"type":"WEB","url":"https://github.com/trentm/python-markdown2/issues/750"},{"type":"WEB","url":"https://github.com/trentm/python-markdown2/pull/751"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/python-markdown2-through-2.5.5-denial-of-service-via-unclosed-inline-link-destinations"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T22:17:13.700"}}