High severityNVD Advisory· Published Mar 27, 2025· Updated Mar 27, 2025
Synapse vulnerable to federation denial of service via malformed events
CVE-2025-30355
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | < 1.127.1 | 1.127.1 |
Affected products
3- ghsa-coords2 versions
< 1.127.1+ 1 more
- (no CPE)range: < 1.127.1
- (no CPE)range: < 1.127.1-1.1
- Range: < 1.127.1
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-v56r-hwv5-mxg6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-30355ghsaADVISORY
- github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389ghsax_refsource_MISCWEB
- github.com/element-hq/synapse/releases/tag/v1.127.1ghsax_refsource_MISCWEB
- github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6ghsax_refsource_CONFIRMWEB
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