PatchTheCVECVE-2024-37302: Synapse is an open-source Matrix homeserver
CVE-2024-37302 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. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Syn
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 | 0.6% (top 52%) |
| CISA exploited list | No |
| Weakness | CWE-770 |
| Published | 2024-12-03 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2024-37302?
synapse: upgrade to 1.106.0. Exact commands for each OS are on this page.
Is CVE-2024-37302 being exploited?
CVE-2024-37302 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-2024-37302 affect?
CVE-2024-37302 affects synapse. Severity is high (CVSS 7.5). Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate lim
How urgent is CVE-2024-37302?
Priority 43/100. High severity; Remotely exploitable, no login, no user action
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