https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-03T08:39:45.247274+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-255153 EUVD-2026-255153 2026-10-03T08:39:45.251088+00:00 EUVD-2026-255153 https://cve.radiocsirt.org/vuln/fkie_cve-2025-61672 fkie_cve-2025-61672 2026-10-03T08:39:45.251120+00:00

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.

 https://cve.radiocsirt.org/vuln/ghsa-fh66-fcv5-jjfr GHSA-fh66-fcv5-jjfr — Synapse's invalid device keys degrade federation functionality 2026-10-03T08:39:45.251153+00:00

Affected: PyPI: matrix-synapse

### Impact

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.

### Patches

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, it is recommend to skip these releases and upgrading straight to 1.138.4 and 1.139.2.

### Workarounds

The vulnerability can only be exploited by users registered on the victim homeserver.

 https://cve.radiocsirt.org/vuln/opensuse-su-2025:15603-1 openSUSE-SU-2025:15603-1 — matrix-synapse-1.139.1-1.1 on GA media 2026-10-03T08:39:45.251186+00:00

matrix-synapse-1.139.1-1.1 on GA media

 https://cve.radiocsirt.org/vuln/pysec-2026-1612 PYSEC-2026-1612 — Synapse's invalid device keys degrade federation functionality 2026-10-03T08:39:45.251203+00:00

Affected: PyPI: matrix-synapse

### Impact

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.

### Patches

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, it is recommend to skip these releases and upgrading straight to 1.138.4 and 1.139.2.

### Workarounds

The vulnerability can only be exploited by users registered on the victim homeserver.

 https://cve.radiocsirt.org/vuln/ubuntu-cve-2025-61672 UBUNTU-CVE-2025-61672 2026-10-03T08:39:45.251240+00:00

Affected: Ubuntu:Pro:18.04:LTS: matrix-synapse, Ubuntu:Pro:20.04:LTS: matrix-synapse, Ubuntu:Pro:22.04:LTS: matrix-synapse, Ubuntu:24.04:LTS: matrix-synapse

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.