{"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_01M5KGY4G2SWN5B4X097XAM61R","modified_at":"2026-07-13T07:15:18.812243616Z","published_at":"2026-07-08T17:17:28.600Z","references":["https://osv.dev/vulnerability/PYSEC-2026-2216","https://github.com/lepture/mistune/releases/tag/v3.3.0","https://github.com/lepture/mistune/commit/2b04d7ba341c16ac78fe82d3076bdd5c3de87c69","https://github.com/lepture/mistune/security/advisories/GHSA-ffq3-xpv3-j92q"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2026-2216","url":"https://osv.dev/vulnerability/PYSEC-2026-2216"}],"summary":"Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a Markdown document containing many repeated or distinct reference-link definitions causes quadratic work in src/mistune"}