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

Q: How do I fix CVE-2024-52805?

synapse: upgrade to 1.120.1. Exact commands for each OS are on this page.

Q: Is CVE-2024-52805 being exploited?

CVE-2024-52805 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-52805 affect?

CVE-2024-52805 affects synapse. Severity is high (CVSS 7.5). 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 use

Q: How urgent is CVE-2024-52805?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2024-52805 is a high-severity flaw (CVSS 7.5) affecting synapse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-770
Published	2024-12-03
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: matrix

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-12-03 17:15 UTCPublished CVE record published
2026-06-17 08:07 UTCUpdated Record last modified

matrix synapse UPGRADE

Affected: < 1.120.1

Fixed in: 1.120.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy synapse || rpm -q synapse || synapse --version

2. UPGRADE to 1.120.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade synapse

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade synapse

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-52805?

synapse: upgrade to 1.120.1. Exact commands for each OS are on this page.

Is CVE-2024-52805 being exploited?

CVE-2024-52805 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-52805 affect?

CVE-2024-52805 affects synapse. Severity is high (CVSS 7.5). 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 use

How urgent is CVE-2024-52805?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

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References

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