{"id":"CVE-2026-118694","aliases":[],"cve":{"records":[{"id":"CVE-2026-118694","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-28T17:31:29.498Z","published":"2026-10-28T21:11:20.814Z","modified":"2026-10-29T17:22:18.429Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-28T21:11:20.814Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T17:22:18.429Z"}],"references":[{"url":"https://github.com/trentm/python-markdown2/issues/750","tags":["issue-tracking"],"source":"VulnCheck"},{"url":"https://github.com/trentm/python-markdown2","tags":["product"],"source":"VulnCheck"},{"url":"https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/trentm/python-markdown2/pull/751","tags":["patch","issue-tracking"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/python-markdown2-through-2.5.5-denial-of-service-via-unclosed-inline-link-destinations","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-407","description":"Inefficient Algorithmic Complexity","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:python-markdown2_project:python-markdown2:*:*:*:*:*:*:*:*","versionEndIncluding":"2.5.5"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T15:43:38.163754Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations","titleSource":"VulnCheck","descriptionSource":"VulnCheck","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.","score":8.7,"severity":"high","published":"2026-10-28T21:11:20.814Z","modified":"2026-10-29T17:22:18.429Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"trentm","name":"python-markdown2","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.5.5","versionType":"custom"}],"defaultStatus":"unaffected","packageURL":"pkg:pypi/markdown2","packageIdentity":{"ecosystem":"PyPI","name":"markdown2"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-118694"}],"remediation":[],"references":["https://github.com/trentm/python-markdown2/issues/750","https://github.com/trentm/python-markdown2","https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492","https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029","https://github.com/trentm/python-markdown2/pull/751","https://www.vulncheck.com/advisories/python-markdown2-through-2.5.5-denial-of-service-via-unclosed-inline-link-destinations"],"sources":[{"name":"CVE","id":"CVE-2026-118694","modified":"2026-10-29T17:22:18.429Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-118694"}],"assessments":[{"source":"VulnCheck","vector":"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","score":8.7},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5}],"sourceAffected":[],"observedAt":"2026-10-29T17:51:52.592Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T14:10:32.801Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-28T23:55:30.852Z","attemptedAt":"2026-10-28T23:55:30.852Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-28T23:55:31.097Z","attemptedAt":"2026-10-28T23:55:31.097Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-28T23:55:31.097Z","attemptedAt":"2026-10-28T23:55:31.097Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-28T23:55:31.101Z","attemptedAt":"2026-10-28T23:55:31.101Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-118694","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118694","modified":"2026-10-28T22:17:13.700","score":8.7,"vector":"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","checkedAt":"2026-10-28T23:55:30.852Z"},{"source":"NVD","id":"CVE-2026-118694","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118694","modified":"2026-10-28T22:17:13.700","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-10-28T23:55:30.852Z"},{"source":"ENISA EUVD","id":"EUVD-2026-112495","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112495","modified":"Oct 28, 2026, 9:11:20 PM","score":8.7,"vector":"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","checkedAt":"2026-10-28T23:55:31.097Z"}],"aiSummary":{"text":"python-markdown2 through 2.5.5 has a denial of service vulnerability allowing remote users to exhaust CPU with unclosed inline link destinations. Attackers can submit repeated link sequences, causing quadratic CPU time consumption. Remote access is required.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:54:27.463Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-118694"}]}}