matrix-synapse: Synapse is an open source Matrix homeserver implementation
CVE-2025-61672 is fixed in matrix-synapse on 1 platform by DEBIAN-CVE-2025-61672 (version 1.139.2-1), released October 8, 2025. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| matrix-synapse · Debian 14 | 1.139.2-1 | DEBIAN-CVE-2025-61672 | Oct 8, 2025 |
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