Synapse allows unsupported content types to lead to memory exhaustion
Priority MEDIUM 43CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.
Summary
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 it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00739 54th percentileScored 2026-11-07
Fix Fixed synapse (element-hq): 1.120.1matrix-synapse (PyPI): 1.120.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| element-hq | synapse | before 1.120.1 | 1.120.1 | Patch available | CNA |
| — | matrix-synapse (PyPI) | before 1.120.1 | 1.120.1 | Patch available | GHSA-rfq8-j7rh-8hf2 |
- synapse Vendorelement-hq Affected before 1.120.1 Fixed in 1.120.1 Patch available CNA
- matrix-synapse (PyPI) Vendor— Affected before 1.120.1 Fixed in 1.120.1 Patch available GHSA-rfq8-j7rh-8hf2
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* | before 1.120.1 | Vulnerable | matrix-org |
- cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* Versions before 1.120.1 Vulnerable ·matrix-org
Remediation
- Fix · CNA synapse (element-hq) Fixed in 1.120.1
- Fix · GHSA-rfq8-j7rh-8hf2 matrix-synapse (PyPI) Fixed in 1.120.1 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2024-52805
- 2026-10-03 Alias added: GHSA-rfq8-j7rh-8hf2
References
Advisory 2
More element-hq vulnerabilities
- TI-2024-35327 Synapse allows a a malformed invite to break the invitee's `/sync` CVSS 4.0HIGH 8.7
- TI-2024-36056 Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders CVSS 4.0HIGH 8.2
- TI-2022-07650 Remote program execution with user interaction CVSS 3.1HIGH 8.8
- TI-2026-19372 ESS Community Helm Chart has a weak server key generation method CVSS 4.0CRITICAL 9.2
- TI-2024-24814 Synapse denial of service through media disk space consumption CVSS 3.1HIGH 7.5
- TI-2026-35452 Element Call reports full URLs of visited pages to analytics server CVSS 4.0HIGH 8.6
Sources
- CVE-2024-52805 · CVE Program
- CVE-2024-52805 · NVD
- FIRST EPSS
- GHSA-rfq8-j7rh-8hf2 · GitHub Advisory Database · CC BY 4.0
- CVE-2024-52805 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences