CVE-2026-45076

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.

PUBLISHED Reserved 2026-05-08 | Published 2026-05-28 | Updated 2026-06-02 | Assigner GitHub_M

Problem types

CWE-20: Improper Input Validation

Product status

References

github.com/...ynapse/security/advisories/GHSA-6qf2-7x63-mm6v

cve.org (CVE-2026-45076)

nvd.nist.gov (CVE-2026-45076)

Download JSON