CVE-2026-45078

Medium

Open

TLP:CLEAR

Synapse CPU starvation (Denial of Service)

NVD CVE.org

DDoS

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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.

Details

CVSS Score: 6.8
EPSS Score ⓘ: 0.13%

2.9th percentile
CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Confidence: 90%
Published: May 28, 2026
Last Modified: May 28, 2026

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