{"action":"Upgrade mistune to 3.3.0 or later.","affected":[{"fixed":"3.3.0","introduced":"0"}],"component":"mistune","cve_ids":["CVE-2026-59928"],"ecosystem":"PyPI","epss":0.00651,"exploited":false,"fixed_versions":["3.3.0"],"ghsa_id":"GHSA-ffq3-xpv3-j92q","id":"tcs_01M5KFF6NNP5FCZSHC68AYV3JS","modified_at":"2026-07-20T21:30:38.320453360Z","published_at":"2026-07-20T21:24:18Z","references":["https://osv.dev/vulnerability/GHSA-ffq3-xpv3-j92q","https://github.com/lepture/mistune/security/advisories/GHSA-ffq3-xpv3-j92q","https://nvd.nist.gov/vuln/detail/CVE-2026-59928","https://github.com/lepture/mistune/commit/2b04d7ba341c16ac78fe82d3076bdd5c3de87c69","https://github.com/lepture/mistune","https://github.com/lepture/mistune/releases/tag/v3.3.0","https://github.com/pypa/advisory-database/tree/main/vulns/mistune/PYSEC-2026-2216.yaml"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-ffq3-xpv3-j92q","url":"https://osv.dev/vulnerability/GHSA-ffq3-xpv3-j92q"}],"summary":"Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions"}