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CVE PROGRAM SOURCE RECORD5.1 Medium

CVE-2026-45076

Synapse pagination denial of service

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

element-hq synapse

  • < 1.152.1affected

References