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Release Wed, May 13, 2026 1 min read

Matrix Synapse 1.152.1

Original release notes

Synapse 1.152.1 (2026-05-07)

Security Fixes

  • Prevent CPU starvation (Denial of Service) under worker lock contention, additionally capping the WorkerLock time out interval to a maximum of 60 seconds. Contributed by Famedly. (#19394, ELEMENTSEC-2026-1706, GHSA-8q93-326v-3m7g, CVE-2026-45078)
  • Prevent pagination ending when a page is full of rejected events. (ELEMENTSEC-2025-1636, GHSA-6qf2-7x63-mm6v, CVE-2026-45076)

Tracked CVEs

  • CVE-2026-45076
  • CVE-2026-45078