{"action":"Upgrade league/commonmark to 2.10.0 or later.","affected":[{"fixed":"2.10.0","introduced":"1.5.0"}],"component":"league/commonmark","cve_ids":["CVE-2026-86428"],"ecosystem":"Packagist","epss":0.00493,"exploited":false,"fixed_versions":["2.10.0"],"ghsa_id":"GHSA-8rr7-cvq3-gmfh","id":"tcs_01M5KEZA8WBT2SSKEP9FFKBGZ9","modified_at":"2026-09-08T12:38:22.249941741Z","published_at":"2026-09-01T20:28:40Z","references":["https://osv.dev/vulnerability/GHSA-8rr7-cvq3-gmfh","https://github.com/thephpleague/commonmark/security/advisories/GHSA-8rr7-cvq3-gmfh","https://github.com/thephpleague/commonmark/commit/f27eb720972490b5af4dbb635ad8634529faf9f2","https://github.com/thephpleague/commonmark","https://github.com/thephpleague/commonmark/releases/tag/2.10.0"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-8rr7-cvq3-gmfh","url":"https://osv.dev/vulnerability/GHSA-8rr7-cvq3-gmfh"}],"summary":"league/commonmark: Denial of service via distinctly-named attributes in the Attributes extension"}