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.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7g
Scores
CVSS v3
5.5
EPSS
0.0013
EPSS Percentile
2.8%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-770
Status
published
Products (3)
element/synapse
< 1.152.1
element-hq/synapse
< 1.152.1
pypi/matrix-synapse
0 - 1.152.1PyPI
Published
May 28, 2026
Tracked Since
May 28, 2026