{"id":"CVE-2026-118694","published":"2026-10-28T22:17:13.700","lastModified":"2026-10-28T22:17:13.700","description":"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.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-407"],"vendors":[],"products":[],"references":[{"url":"https://github.com/trentm/python-markdown2","tags":[]},{"url":"https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492","tags":[]},{"url":"https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029","tags":[]},{"url":"https://github.com/trentm/python-markdown2/issues/750","tags":[]},{"url":"https://github.com/trentm/python-markdown2/pull/751","tags":[]},{"url":"https://www.vulncheck.com/advisories/python-markdown2-through-2.5.5-denial-of-service-via-unclosed-inline-link-destinations","tags":[]}],"exploitRefs":[{"url":"https://github.com/trentm/python-markdown2","tags":[]},{"url":"https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492","tags":[]},{"url":"https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029","tags":[]},{"url":"https://github.com/trentm/python-markdown2/issues/750","tags":[]},{"url":"https://github.com/trentm/python-markdown2/pull/751","tags":[]}],"hasPoc":true,"ai":null}