Improper Validation of Specified Type of Input Affecting matrix-synapse package, versions [,1.138.3)[1.139.0rc2, 1.139.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-MATRIXSYNAPSE-13506786
- published10 Oct 2025
- disclosed8 Oct 2025
- creditDenis Kasak
Introduced: 8 Oct 2025
NewCVE-2025-61672 (opens in a new tab)How to fix?
Upgrade matrix-synapse to version 1.138.3, 1.139.1 or higher.
Overview
matrix-synapse is an ecosystem for open federated Instant Messaging and VoIP.
Affected versions of this package are vulnerable to Improper Validation of Specified Type of Input due to insufficient validation of device keys. An attacker can disrupt federation functionality and unpredictably break outbound federation to other homeservers by registering on the victim homeserver and submitting invalid device keys. This is only exploitable if the attacker is a registered user on the victim homeserver.
Note
Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, we recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2.