HighGHSA-4pg4-qvpc-4q3hCVE-2025-47944

Multer vulnerable to Denial of Service from maliciously crafted requests

Published 19 May 2025 · Updated 10 Sept 2026

Affected package

multernpm
Affected
>=1.4.4-lts.1 <2.0.0
Fixed in
2.0.0
Update to the fixed version for your release line, for example:npm install multer@2.0.0

Details

Impact

A vulnerability in Multer versions >=1.4.4-lts.1 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.

Patches

Users should upgrade to 2.0.0

Workarounds

None

References

  • https://github.com/expressjs/multer/issues/1176
  • https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665

Is GHSA-4pg4-qvpc-4q3h in any of your client repos?

Checking one package by hand is fine. Checking it across forty client projects is not. NPMscan reads the lockfiles in every GitHub repo you pick, finds each project with an affected multer, and gives you the command that fixes it.

Scan a project free, no signupOr connect GitHub to scan every repo

References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.