AIKIDO-2026-191135
matrix-synapse is vulnerable to Uncontrolled Resource Consumption
75
High Risk
This Affects:
matrix-synapseTL;DR
Synapse's existing mitigation against malicious multipart/form-data requests performs a case-sensitive check on the Content-Type header. By varying the case of the header, a client can bypass the mitigation. A crafted request then causes Synapse to rapidly exhaust all available memory and become unresponsive or be terminated, denying service to other users. The fix makes the content-type check case-insensitive.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
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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