{"id":"CVE-2025-61672","aliases":["ALPINE-CVE-2025-61672","DEBIAN-CVE-2025-61672","EUVD-2025-33305","GHSA-fh66-fcv5-jjfr","PYSEC-2026-1612","UBUNTU-CVE-2025-61672","openSUSE-SU-2025:15603-1"],"status":"published","title":"Synapse: Invalid device keys degrade federation functionality","description":"Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.","severity":{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00476,"percentile":0.41435,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1287"],"published":"2025-10-07T00:00:00Z","modified":"2026-11-03T06:32:52Z","fixes":[{"ecosystem":"PyPI","package":"matrix-synapse","fixed_in":["1.138.3","1.139.1"],"sources":["ghsa","osv"]},{"ecosystem":"Alpine:v3.22","package":"synapse","fixed_in":["1.139.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"synapse","fixed_in":["1.139.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"synapse","fixed_in":["1.139.2-r0"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"matrix-synapse","fixed_in":["1.139.1-1.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"matrix-synapse","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.138.3"}]}]},{"source":"ghsa","ecosystem":"PyPI","package":"matrix-synapse","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.139.0rc2"},{"fixed":"1.139.1"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"synapse","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.139.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"synapse","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.139.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"synapse","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.139.2-r0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"matrix-synapse","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.138.3"}]}],"versions":["0.33.5","0.33.5.1","0.33.6","0.33.6rc1","0.33.7","0.33.7rc1","0.33.7rc2","0.33.8","0.33.8rc2","0.33.9","0.34.0","0.34.0.1","0.34.0rc1","0.34.0rc2","0.34.1.1","0.99.0","0.99.0rc1","0.99.0rc2","0.99.0rc3","0.99.0rc4","0.99.1","0.99.1.1","0.99.1rc1","0.99.1rc2","0.99.2","0.99.2rc1","0.99.3","0.99.3.1","0.99.3.2","0.99.3rc1","0.99.4","0.99.4rc1","0.99.5","0.99.5.1","0.99.5.2","0.99.5rc1","1.0.0","1.0.0rc1","1.0.0rc2","1.0.0rc3","1.1.0","1.1.0rc1","1.1.0rc2","1.10.0","1.10.0rc1","1.10.0rc2","1.10.0rc3","1.10.0rc5","1.10.1","1.100.0","1.100.0rc2","1.100.0rc3","1.101.0","1.101.0rc1","1.102.0","1.102.0rc1","1.103.0","1.103.0rc1","1.104.0","1.104.0rc1","1.105.0","1.105.0rc1","1.105.1","1.106.0","1.106.0rc1","1.107.0","1.107.0rc1","1.108.0","1.108.0rc1","1.109.0","1.109.0rc1","1.109.0rc2","1.109.0rc3","1.11.0","1.11.0rc1","1.11.1","1.110.0","1.110.0rc2","1.110.0rc3","1.111.0","1.111.0rc1","1.111.0rc2","1.111.1","1.112.0","1.112.0rc1","1.113.0","1.113.0rc1","1.114.0","1.114.0rc1","1.114.0rc3","1.115.0","1.115.0rc1","1.115.0rc2","1.116.0","1.116.0rc1","1.116.0rc2","1.117.0","1.117.0rc1","1.118.0","1.118.0rc1","1.119.0","1.119.0rc2","1.12.0","1.12.0rc1","1.12.1","1.12.1rc1","1.12.2","1.12.3","1.12.4","1.12.4rc1","1.120.0","1.120.0rc1","1.120.2","1.121.0","1.121.0rc1","1.121.1","1.122.0","1.122.0rc1","1.123.0","1.123.0rc1","1.124.0","1.124.0rc1","1.124.0rc2","1.124.0rc3","1.125.0","1.125.0rc1","1.126.0","1.126.0rc2","1.126.0rc3","1.127.0","1.127.0rc1","1.127.1","1.128.0","1.128.0rc1","1.129.0","1.129.0rc2","1.13.0","1.13.0rc1","1.13.0rc2","1.13.0rc3","1.130.0","1.130.0rc1","1.131.0","1.131.0rc1","1.132.0","1.132.0rc1","1.133.0","1.133.0rc1","1.134.0","1.134.0rc1","1.135.0","1.135.0rc1","1.135.0rc2","1.135.2","1.136.0","1.136.0rc1","1.136.0rc2","1.137.0","1.137.0rc1","1.138.0","1.138.0rc1","1.138.2","1.14.0","1.14.0rc1","1.14.0rc2","1.15.0","1.15.0rc1","1.15.1","1.15.2","1.16.0","1.16.0rc1","1.16.0rc2","1.16.1","1.17.0","1.17.0rc1","1.18.0","1.18.0rc1","1.18.0rc2","1.19.0","1.19.0rc1","1.19.1","1.19.1rc1","1.19.2","1.19.3","1.2.0","1.2.0rc1","1.2.0rc2","1.2.1","1.20.0","1.20.0rc1","1.20.0rc2","1.20.0rc3","1.20.0rc4","1.20.0rc5","1.20.1","1.21.0","1.21.0rc1","1.21.0rc2","1.21.0rc3","1.21.1","1.21.2","1.22.0","1.22.0rc1","1.22.0rc2","1.22.1","1.23.0","1.23.0rc1","1.23.1","1.24.0","1.24.0rc1","1.24.0rc2","1.25.0","1.25.0rc1","1.26.0","1.26.0rc1","1.26.0rc2","1.27.0","1.27.0rc1","1.27.0rc2","1.28.0","1.28.0rc1","1.29.0","1.29.0rc1","1.3.0","1.3.0rc1","1.3.1","1.30.0","1.30.0rc1","1.30.1","1.31.0","1.31.0rc1","1.32.0","1.32.0rc1","1.32.1","1.32.2","1.33.0","1.33.0rc1","1.33.0rc2","1.33.1","1.33.2","1.34.0","1.34.0rc1","1.35.0","1.35.0rc1","1.35.0rc2","1.35.0rc3","1.35.1","1.36.0","1.36.0rc1","1.36.0rc2","1.37.0","1.37.0rc1","1.37.1","1.37.1rc1","1.38.0","1.38.0rc1","1.38.0rc2","1.38.0rc3","1.38.1","1.39.0","1.39.0rc1","1.39.0rc2","1.39.0rc3","1.4.0","1.4.0rc1","1.4.0rc2","1.4.1","1.4.1rc1","1.40.0","1.40.0rc1","1.40.0rc2","1.40.0rc3","1.41.0","1.41.0rc1","1.41.1","1.42.0","1.42.0rc1","1.42.0rc2","1.43.0","1.43.0rc1","1.43.0rc2","1.44.0","1.44.0rc1","1.44.0rc2","1.44.0rc3","1.45.0","1.45.0rc1","1.45.0r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,"tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2025-61672","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-61672","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2025-61672","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2025-61672","title":"Synapse: Invalid device keys degrade federation functionality","description":"Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.","status":"published","published":"2025-10-08T14:55:06.378Z","modified":"2025-10-15T16:11:07.284Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-1287"],"updated_at":"2026-11-02T14:32:45.105469Z"}],"euvd":[{"id":"EUVD-2025-33305","description":"Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.","status":"published","published":"2025-10-08T14:55:06Z","modified":"2025-10-15T16:11:07Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T20:31:31.584227Z"}],"ghsa":[{"id":"GHSA-fh66-fcv5-jjfr","title":"Synapse's invalid device keys degrade federation functionality","description":"### Impact\n\nLack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. \n\n### Patches\n\nPatched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2.\n\nNote that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, it is recommend to skip these releases and upgrading straight to 1.138.4 and 1.139.2.\n\n### Workarounds\n\nThe vulnerability can only be exploited by users registered on the victim homeserver.","status":"published","published":"2025-10-08T17:51:02Z","modified":"2025-10-08T17:51:03Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-1287"],"updated_at":"2026-11-02T14:38:59.83883Z"}],"nvd":[{"id":"CVE-2025-61672","description":"Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.","status":"published","published":"2025-10-08T15:16:25.11Z","modified":"2026-10-08T13:10:00.2Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-1287"],"updated_at":"2026-11-02T14:11:35.93863Z"}],"osv":[{"id":"ALPINE-CVE-2025-61672","description":"Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.","status":"published","published":"2025-10-08T15:16:25.11Z","modified":"2026-11-03T06:32:52.079472922Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-03T07:16:26.770911Z"},{"id":"CVE-2025-61672","title":"Synapse: Invalid device keys degrade federation functionality","description":"Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.","status":"published","published":"2025-10-08T14:55:06.378Z","modified":"2026-10-28T02:30:25.508694748Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-1287"],"updated_at":"2026-11-02T15:44:51.516975Z"},{"id":"DEBIAN-CVE-2025-61672","description":"Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.","status":"withdrawn","published":"2025-10-08T15:16:25.11Z","modified":"2026-08-11T20:49:53.670669145Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-02T15:45:47.697959Z"},{"id":"GHSA-fh66-fcv5-jjfr","title":"Synapse's invalid device keys degrade federation functionality","description":"### Impact\n\nLack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. \n\n### Patches\n\nPatched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2.\n\nNote that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, it is recommend to skip these releases and upgrading straight to 1.138.4 and 1.139.2.\n\n### Workarounds\n\nThe vulnerability can only be exploited by users registered on the victim homeserver.","status":"published","published":"2025-10-08T17:51:02Z","modified":"2026-07-07T17:56:22.342793625Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-1287"],"updated_at":"2026-11-02T15:46:46.39441Z"},{"id":"PYSEC-2026-1612","title":"Synapse's invalid device keys degrade federation functionality","description":"### Impact\n\nLack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. \n\n### Patches\n\nPatched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2.\n\nNote that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, it is recommend to skip these releases and upgrading straight to 1.138.4 and 1.139.2.\n\n### Workarounds\n\nThe vulnerability can only be exploited by users registered on the victim homeserver.","status":"published","published":"2026-07-07T16:03:07.105115Z","modified":"2026-07-07T17:46:57.33778982Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T15:52:55.06457Z"},{"id":"UBUNTU-CVE-2025-61672","description":"Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.","status":"published","published":"2025-10-08T15:16:00Z","modified":"2025-10-24T05:23:37Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:55:50.817402Z"},{"id":"openSUSE-SU-2025:15603-1","title":"matrix-synapse-1.139.1-1.1 on GA media","description":"These are all security issues fixed in the matrix-synapse-1.139.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-10-07T00:00:00Z","modified":"2026-03-23T04:53:59.312403Z","updated_at":"2026-11-02T16:58:37.810934Z"}]}}