CVE-2026-45078

published 2026-05-28

CVE-2026-45078: 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…

medium 6.8 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 E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU X R X V X RE X U X

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

2 ranges

Vendor	Product	Version range	Fixed in
debian	matrix-synapse	>= 0 < 1.152.1	1.152.1
element-hq	synapse	< 1.152.1	1.152.1

CWE-770 CWE-400