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Release Notes 26.4 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 26.4.2 (2026-05-18)

Changed

  • Ensure consistency of the volumeMounts for custom Certificate Authorities.

Fixed

  • Fix S3 media cleanup sidecar not being able to connect to Synapse's database.

  • Fixed error when fetching server keys using the Pro federation reader worker.

  • Ensure turn.external_tls is correctly set in the Matrix RTC SFU configuration depending on matrixRTC.sfu.exposedServices.turnTLS.tlsTerminationOnPod.

  • Ensure no TI-Messenger sidecar manifests are rendered if the Secure Border Gateway is disabled.

  • Fixed matrixRTC.sfu.exposedServices.rtpUdp not documenting externalTrafficPolicy or internalTrafficPolicy.

  • TI-Messenger: Fix an issue where Synapse would be denied access to the Federation List Service.

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: