{"action":"Upgrade league/commonmark to 2.9.0 or later.","affected":[{"fixed":"2.9.0","introduced":"1.5.0"}],"component":"league/commonmark","cve_ids":["CVE-2026-71478"],"ecosystem":"Packagist","epss":0.00355,"exploited":false,"fixed_versions":["2.9.0"],"ghsa_id":"GHSA-29pj-957v-52mc","id":"tcs_01M5KERSPMET0FWVZ1Z4TPA7TS","modified_at":"2026-08-21T05:28:22.850809866Z","published_at":"2026-08-06T20:30:39Z","references":["https://osv.dev/vulnerability/GHSA-29pj-957v-52mc","https://github.com/thephpleague/commonmark/security/advisories/GHSA-29pj-957v-52mc","https://github.com/thephpleague/commonmark/commit/493a5aa7d65754b73846006eaff9c2c4431a8e2c","https://github.com/thephpleague/commonmark","https://github.com/thephpleague/commonmark/releases/tag/2.9.0"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"GHSA-29pj-957v-52mc","url":"https://osv.dev/vulnerability/GHSA-29pj-957v-52mc"}],"summary":"league/commonmark: AttributesExtension href/src unsafe-link filter bypass via embedded control bytes"}