# CVE-2024-52805: matrix-synapse: Synapse is an open-source Matrix homeserver

CVE-2024-52805 is fixed in matrix-synapse on 1 platform by DEBIAN-CVE-2024-52805 (version 1.121.0-1), released December 3, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-52805
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0074
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 3, 2024

## Description

Synapse is an open-source Matrix homeserver. 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. Synapse 1.120.1 resolves the issue by denying requests with unsupported multipart/form-data content type.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | matrix-synapse Debian 14 | 1.121.0-1 | [DEBIAN-CVE-2024-52805](https://patchblox.com/security/data/fix/linux/debian-cve-2024-52805.md) | Dec 3, 2024 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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