CVE-2025-30355 Information

Description

Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which when received prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed in Synapse v1.127.1. No known workarounds are available.

Reference

https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389 https://github.com/element-hq/synapse/releases/tag/v1.127.1 https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6