Allocation of Resources Without Limits or Throttling Affecting synapse package, versions <1.153.0-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.13% (3rd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-SYNAPSE-16801614
  • published23 May 2026
  • disclosed28 May 2026

Introduced: 23 May 2026

CVE-2026-45078  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Chainguard synapse to version 1.153.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream synapse package and not the synapse package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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 Base Scores

version 3.1