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Improper Input Validation The advisory has been revoked - it doesn't affect any version of package matrix-synapse  (opens in a new tab)

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EPSS
0.98% (58th percentile)

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  • Snyk IDSNYK-UBUNTU2004-MATRIXSYNAPSE-5603692
  • published8 Apr 2025
  • disclosed26 May 2023
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Introduced: 26 May 2023

CVE-2023-32323  (opens in a new tab)
CWE-20  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream matrix-synapse package and not the matrix-synapse package as distributed by Ubuntu.

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of invite_room_state, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized invite_room_state fields. Server operators should upgrade to Synapse 1.74 or newer urgently.