@fastify/multipart vulnerable to unlimited consumption of resources
Priority HIGH 68CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.
Summary
@fastify/multipart is a Fastify plugin for parsing the multipart content-type. Prior to versions 8.3.1 and 9.0.3, the `saveRequestFiles` function does not delete the uploaded temporary files when user cancels the request. The issue is fixed in versions 8.3.1 and 9.0.3. As a workaround, do not use `saveRequestFiles`.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00602 49th percentileScored 2026-11-07
Fix Fixed fastify-multipart (fastify): 8.3.1, 9.0.3@fastify/multipart (npm): 8.3.1, 9.0.3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
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 |
|---|---|---|---|---|---|
| fastify | fastify-multipart | before 8.3.1; 9.0.0 to before 9.0.3 | 8.3.1, 9.0.3 | Patch available | CNA |
| — | @fastify/multipart (npm) | before 8.3.1 | 8.3.1 | Patch available | GHSA-27c6-mcxv-x3fh |
| — | @fastify/multipart (npm) | 9.0.0 to before 9.0.3 | 9.0.3 | Patch available | GHSA-27c6-mcxv-x3fh |
- fastify-multipart Vendorfastify Affected before 8.3.1; 9.0.0 to before 9.0.3 Fixed in 8.3.1, 9.0.3 Patch available CNA
- @fastify/multipart (npm) Vendor— Affected before 8.3.1 Fixed in 8.3.1 Patch available GHSA-27c6-mcxv-x3fh
- @fastify/multipart (npm) Vendor— Affected 9.0.0 to before 9.0.3 Fixed in 9.0.3 Patch available GHSA-27c6-mcxv-x3fh
Remediation
- Fix · CNA fastify-multipart (fastify) Fixed in 8.3.1, 9.0.3
- Fix · GHSA-27c6-mcxv-x3fh @fastify/multipart (npm) Fixed in 8.3.1 Advisory →
- Fix · GHSA-27c6-mcxv-x3fh @fastify/multipart (npm) Fixed in 9.0.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-24033
- 2026-10-03 Alias added: GHSA-27c6-mcxv-x3fh
References
More fastify vulnerabilities
- TI-2026-26180 @fastify/express vulnerable to middleware authentication bypass via URL normalization… CVSS 4.0CRITICAL 9.1
- TI-2026-26179 @fastify/express vulnerable to middleware path doubling causing authentication bypass in child plugin scopes CVSS 3.1CRITICAL 9.1
- TI-2026-26177 @fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers CVSS 4.0CRITICAL 9.0
- TI-2026-05498 @fastify/middie vulnerable to middleware authentication bypass in child plugin scopes CVSS 3.1CRITICAL 9.1
- TI-2023-15307 Cross-site request forgery in npm @fastify/oauth2 CVSS 3.1HIGH 8.8
- TI-2022-18664 Denial of service in Fastify via Content-Type header CVSS 3.1HIGH 7.5
Sources
- CVE-2025-24033 · CVE Program
- CVE-2025-24033 · NVD
- FIRST EPSS
- GHSA-27c6-mcxv-x3fh · GitHub Advisory Database · CC BY 4.0
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