{"id":"CVE-2026-115349","aliases":[],"cve":{"records":[{"id":"CVE-2026-115349","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-22T11:20:02.626Z","published":"2026-10-22T19:13:26.171Z","modified":"2026-10-26T19:38:30.354Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-22T19:13:26.171Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-26T19:38:30.354Z"}],"references":[{"url":"https://github.com/lepture/mistune/security/advisories/GHSA-3q64-rw38-243v","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/mistune-3.0.0-before-3.3.0-denial-of-service-via-nested-bracket-parsing","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-1333","description":"Inefficient Regular Expression Complexity","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*","versionStartIncluding":"3.0.0","versionEndExcluding":"3.3.0"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-26T19:27:03.150656Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests.","score":8.7,"severity":"high","published":"2026-10-22T19:13:26.171Z","modified":"2026-10-26T19:38:30.354Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"lepture","name":"mistune","platforms":[],"versions":[{"version":"3.0.0","status":"affected","lessThan":"3.3.0","versionType":"semver"},{"version":"3.3.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:pypi/mistune","packageIdentity":{"ecosystem":"PyPI","name":"mistune"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-115349"}],"remediation":[],"references":["https://github.com/lepture/mistune/security/advisories/GHSA-3q64-rw38-243v","https://www.vulncheck.com/advisories/mistune-3.0.0-before-3.3.0-denial-of-service-via-nested-bracket-parsing"],"sources":[{"name":"CVE","id":"CVE-2026-115349","modified":"2026-10-26T19:38:30.354Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-115349"}],"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":"2026-10-29T14:34:20.787Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T14:10:32.801Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"Mistune versions 3.0.0 before 3.3.0 contain a denial of service vulnerability due to inefficient parsing of nested brackets, allowing attackers to exhaust server CPU with crafted requests. The vulnerability is in the parse_link_text function. Attackers can submit markdown with deeply nested square brackets, triggering quadratic parsing time.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:49:36.214Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-115349"}]}}