CVE-2026-45078CWE-770

Synapse CPU starvation (Denial of Service)

Medium · published May 28, 2026

CVSS v4.0
6.8
EPSS
0%
Percentile
2.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.8 · MEDIUM
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
EPSS
0.00133 · 2.6th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-05-28T15:52Z
EPSS history
Timeline
  • 28 MAY 15:52Z
    Synapse CPU starvation (Denial of Service)
    cvelistv5