Improper Check for Unusual or Exceptional Conditions Affecting matrix-synapse package, versions [,1.152.1)
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-16726233
- published17 May 2026
- disclosed14 May 2026
- creditUnknown
Introduced: 14 May 2026
CVE-2026-45076 (opens in a new tab)How to fix?
Upgrade matrix-synapse to version 1.152.1 or higher.
Overview
matrix-synapse is an ecosystem for open federated Instant Messaging and VoIP.
Affected versions of this package are vulnerable to Improper Check for Unusual or Exceptional Conditions in the pagination process for federated rooms. An attacker can cause clients to fail to display room history by crafting malicious room events that prevent the retrieval of full history during pagination.