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PYSEC-2023-67
Details
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
PyPI / matrix-synapse
Introduced in:
0 Fixed in: 1.74.0 Fix
pip install --upgrade 'matrix-synapse>=1.74.0'