CVE-2026-45076 — Synapse pagination denial of service
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…
Published: 2026-05-28 · CVSS: 5.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7