Element Synapse vulnerabilities

2 vulnerabilities

Known vulnerabilities in Element Synapse, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

5.1CVE-2026-45076chainguardsynapse+5
EPSS score
0.39%
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 1.152.1.6.8CVE-2026-45078chainguardsynapse+5
EPSS score
0.13%
Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service. This vulnerability is fixed in 1.152.1.