CVE-2026-45078

Synapse CPU starvation (Denial of Service)

CVSS 6.8 MEDIUMEPSS 0.1%CWE-770

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.

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

Affected products

element-hq · synapse

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

References

https://github.com/element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7g