CVE-2026-45076 — Synapse pagination denial of service

CVE-2026-45076

Synapse pagination denial of service PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
element-hq / synapse	affected < 1.152.1

CWE

CWE-20

References

https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.