{"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":0.00476,"exploited":false,"fixed_versions":["1.138.3","1.139.1"],"ghsa_id":"GHSA-fh66-fcv5-jjfr","id":"tcs_01M5KGTMTWSKVEBH898HW6C1PX","modified_at":"2026-07-07T17:46:57.337789820Z","published_at":"2026-07-07T16:03:07.105115Z","references":["https://osv.dev/vulnerability/PYSEC-2026-1612","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","https://pypi.org/project/matrix-synapse","https://github.com/advisories/GHSA-fh66-fcv5-jjfr"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"PYSEC-2026-1612","url":"https://osv.dev/vulnerability/PYSEC-2026-1612"},{"source":"nvd","source_id":"CVE-2025-61672","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-61672"}],"summary":"Synapse's invalid device keys degrade federation functionality"}