What’s Vulnerable › Vulnerabilities
CVE-2026-45078: Synapse CPU starvation (Denial of Service)
- Severity: medium (CVSS 5.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-28 · updated 2026-10-26
- Weakness: CWE-770
Description
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.
Affected products
- Element Synapse: before 1.152.1 — fixed in 1.152.1
How to fix
Upgrade to a fixed version: Element Synapse 1.152.1. Check the vendor advisory for mitigations.
References
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