CVE-2025-61672

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{"bugzilla": {"description": "matrix-synapse: Synapse: Lack of device key validation leads to federation degradation", "id": "2402525", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402525"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-1286", "details": ["Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in Synapse 1.139.0 allow an attacker registered on the victim homeserver to degrade federation functionality, unpredictably breaking outbound federation to other homeservers. The issue is patched in Synapse 1.138.3, 1.138.4, 1.139.1, and 1.139.2. Note that even though 1.138.3 and 1.139.1 fix the vulnerability, they inadvertently introduced an unrelated regression. For this reason, the maintainers of Synapse recommend skipping these releases and upgrading straight to 1.138.4 and 1.139.2."], "name": "CVE-2025-61672", "public_date": "2025-10-08T14:55:06Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-61672\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-61672\nhttps://github.com/element-hq/synapse/commit/26aaaf9e48fff80cf67a20c691c75d670034b3c1\nhttps://github.com/element-hq/synapse/commit/7069636c2d6d1ef2022287addf3ed8b919ef2740\nhttps://github.com/element-hq/synapse/pull/17097\nhttps://github.com/element-hq/synapse/releases/tag/v1.138.3\nhttps://github.com/element-hq/synapse/releases/tag/v1.139.1\nhttps://github.com/element-hq/synapse/security/advisories/GHSA-fh66-fcv5-jjfr"], "statement": "This flaw is rated MODERATE because the highest threat of this flaw is to system availability. However, we further do not ship the vulnerable versions in fedora. Hence, it will be downgraded to a LOW.", "threat_severity": "Low"}

{"created": "2025-10-09T12:51:41.810920+00:00", "updated": "2025-10-09T12:51:41.810956+00:00", "vendors": ["element-hq", "element-hq$PRODUCT$synapse"]}