What’s Vulnerable › Vulnerabilities
CVE-2026-45076: Synapse pagination denial of service
- Severity: low (CVSS 2.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-28 · updated 2026-10-26
- Weakness: CWE-20
Description
Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This vulnerability is fixed in 1.152.1.
Affected products
- Element Synapse: before 1.152.1 — fixed in 1.152.1
How to fix
Upgrade to a fixed version: Element Synapse 1.152.1. Check the vendor advisory for mitigations.
References
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