{"id":"CVE-2026-115349","summary":"Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing","details":"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.","aliases":["GHSA-3q64-rw38-243v"],"modified":"2026-11-04T17:27:22.074521117Z","published":"2026-10-22T19:13:26.171Z","related":["openSUSE-SU-2026:12407-1"],"database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-1333"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115349.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115349.json"},{"type":"ADVISORY","url":"https://github.com/lepture/mistune/security/advisories/GHSA-3q64-rw38-243v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115349"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/mistune-3.0.0-before-3.3.0-denial-of-service-via-nested-bracket-parsing"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/lepture/mistune","events":[{"introduced":"4222ee11c119fc8b308c6f8137f35a394e08065b"},{"fixed":"15c3b79325125272263d7d42492ec8f757447191"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"3.0.0"},{"fixed":"3.3.0"}]},{"source":"DESCRIPTION","range":[{"introduced":"3.0.0"},{"fixed":"3.3.0"}]}]}}],"versions":["v3.2.1","v3.2.0","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0.1","v3.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115349.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"}]}