- 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](https://github.com/element-hq/synapse/issues/19394), ELEMENTSEC-2026-1706, [GHSA-8q93-326v-3m7g](https://github.com/element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7g), CVE pending) - Prevent pagination ending when a page is full of rejected events. (ELEMENTSEC-2025-1636, [GHSA-6qf2-7x63-mm6v](https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v), CVE pending)