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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | < 1.138.3 | 1.138.3 |
matrix-synapsePyPI | >= 1.139.0rc2, < 1.139.1 | 1.139.1 |
Affected products
3- Range: hhs-1, hhs-2, hhs-3, …
- ghsa-coords2 versions
< 1.138.3+ 1 more
- (no CPE)range: < 1.138.3
- (no CPE)range: < 1.139.1-1.1
Patches
Vulnerability mechanics
References
10- github.com/advisories/GHSA-fh66-fcv5-jjfrghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-61672ghsaADVISORY
- github.com/element-hq/synapse/commit/26aaaf9e48fff80cf67a20c691c75d670034b3c1nvdWEB
- github.com/element-hq/synapse/commit/7069636c2d6d1ef2022287addf3ed8b919ef2740nvdWEB
- github.com/element-hq/synapse/pull/17097nvdWEB
- github.com/element-hq/synapse/releases/tag/v1.138.3nvdWEB
- github.com/element-hq/synapse/releases/tag/v1.138.4ghsaWEB
- github.com/element-hq/synapse/releases/tag/v1.139.1nvdWEB
- github.com/element-hq/synapse/releases/tag/v1.139.2ghsaWEB
- github.com/element-hq/synapse/security/advisories/GHSA-fh66-fcv5-jjfrnvdWEB
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