CVE-2025-30355

—

CVSS 3.1

7.5 high

EPSS

1%p66

Published

Mar 27, 2025 (Mar 27, 2025)

Modified

Jun 17, 2026

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.

Vendors: matrix
Products: synapse
Weakness: CWE-20
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (1.2%)

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