AIKIDO-2026-267736
matrix-synapse is vulnerable to Uncontrolled Resource Consumption
77
High Risk
This Affects:
matrix-synapseTL;DR
Synapse lets users configure push rules without any server-side limit on their number or total size. Stored push rules are loaded back into memory when fetched and when processing push rules for new events. A local user can register a very large volume of push rules, exhausting disk space and memory and denying service to other users. The fix enforces server-side size and count limits on push rules.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your homeserver allows untrusted local users.
Background info
matrix-synapse is vulnerable to Uncontrolled Resource Consumption in versions 0.0.1 - 1.157.1.
How to fix this
Upgrade the matrix-synapse library to the patch version.
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