CVE-2025-61672

N/A

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.

CVE Details

CVSS v3.1 ScoreN/A

Published10/8/2025

Last Modified10/8/2025

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-1287

References

https://github.com/element-hq/synapse/commit/26aaaf9e48fff80cf67a20c691c75d670034b3c1(security-advisories@github.com)

https://github.com/element-hq/synapse/commit/7069636c2d6d1ef2022287addf3ed8b919ef2740(security-advisories@github.com)

https://github.com/element-hq/synapse/pull/17097(security-advisories@github.com)

https://github.com/element-hq/synapse/releases/tag/v1.138.3(security-advisories@github.com)

https://github.com/element-hq/synapse/releases/tag/v1.139.1(security-advisories@github.com)

https://github.com/element-hq/synapse/security/advisories/GHSA-fh66-fcv5-jjfr(security-advisories@github.com)

IOC Correlations

No correlations recorded

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