{"action":"Upgrade matrix-synapse to 1.138.3 or later.","affected":[{"fixed":"1.138.3","introduced":"0"},{"fixed":"1.139.1","introduced":"1.139.0rc2"}],"component":"matrix-synapse","cve_ids":["CVE-2025-61672"],"ecosystem":"PyPI","epss":0.00466,"exploited":false,"fixed_versions":["1.138.3","1.139.1"],"ghsa_id":"GHSA-fh66-fcv5-jjfr","id":"tcs_01M5KFFCCF2B1WJCSEPV96B62B","modified_at":"2026-07-07T17:56:22.342793625Z","published_at":"2025-10-08T17:51:02Z","references":["https://osv.dev/vulnerability/GHSA-fh66-fcv5-jjfr","https://github.com/element-hq/synapse/security/advisories/GHSA-fh66-fcv5-jjfr","https://nvd.nist.gov/vuln/detail/CVE-2025-61672","https://github.com/element-hq/synapse/pull/17097","https://github.com/element-hq/synapse/commit/26aaaf9e48fff80cf67a20c691c75d670034b3c1","https://github.com/element-hq/synapse/commit/7069636c2d6d1ef2022287addf3ed8b919ef2740","https://github.com/element-hq/synapse","https://github.com/element-hq/synapse/releases/tag/v1.138.3","https://github.com/element-hq/synapse/releases/tag/v1.138.4","https://github.com/element-hq/synapse/releases/tag/v1.139.1","https://github.com/element-hq/synapse/releases/tag/v1.139.2"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-fh66-fcv5-jjfr","url":"https://osv.dev/vulnerability/GHSA-fh66-fcv5-jjfr"}],"summary":"Synapse's invalid device keys degrade federation functionality"}