https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-03T07:32:42.268409+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/cve-2026-45078 CVE-2026-45078 — Synapse CPU starvation (Denial of Service) 2026-10-03T07:32:42.299842+00:00

Affected: element-hq synapse

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service. This vulnerability is fixed in 1.152.1.

 https://cve.radiocsirt.org/vuln/ghsa-8q93-326v-3m7g GHSA-8q93-326v-3m7g — Synapse CPU starvation (Denial of Service) 2026-10-03T07:32:42.299900+00:00

Affected: PyPI: matrix-synapse

### Impact

Local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service.

Homeservers that trust all their local users are not at risk.

### Patches

Update to Synapse 1.152.1 or later.

### Workarounds

If Synapse is deployed behind a reverse proxy, the reverse proxy could be configured to limit the rate of user requests, preventing or increasing the difficulty of the attack.

### Identifiers

- ELEMENTSEC-2026-1706

### For more information

If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).