CVE-2024-52805: Synapse allows unsupported content types to lead to memory exhaustion

December 3, 2024 (updated October 31, 2025)

In Synapse before 1.120.1, multipart/form-data requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks.

References

github.com/advisories/GHSA-rfq8-j7rh-8hf2
github.com/element-hq/synapse
github.com/element-hq/synapse/security/advisories/GHSA-rfq8-j7rh-8hf2
github.com/twisted/twisted/issues/4688
github.com/twisted/twisted/issues/4688
nvd.nist.gov/vuln/detail/CVE-2024-52805

Code Behaviors & Features

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