CVE - CVE-2025-30355

CVE-ID
CVE-2025-30355	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE 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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389 URL:https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389 MISC:https://github.com/element-hq/synapse/releases/tag/v1.127.1 URL:https://github.com/element-hq/synapse/releases/tag/v1.127.1 MISC:https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6 URL:https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20250321	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250321)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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