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Release Notes 26.04 LTS

Info

ESS Pro 26.4.0 is the start of the 26.4 LTS series. If you are coming from the immediately prior LTS series, upgrading to 26.4 LTS wil get you all the changes that happened on mainline up to 26.4.

ESS Pro LTS 26.4.1 (2026-05-07)

Changed

  • LTS releases will have version numbers ending in +lts.

  • Upgrade Synapse to v1.152.1-lts.1.

    Highlights:

    • 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 pending)
    • Prevent pagination ending when a page is full of rejected events. (ELEMENTSEC-2025-1636, GHSA-6qf2-7x63-mm6v, CVE pending)

    Full Changelogs: