Packages / multer / Security

HighVulnerabilityGHSA-44fp-w29j-9vj5CVE-2025-47935Published 19 May 2025

Multer vulnerable to Denial of Service via memory leaks from unclosed streams

Your version

Affected releases · multer

  • 1.x and older0.0.1 – 1.4.4No fix, no longer updated

1.x has no fix yet; the newest fixed line:

npm install multer@2.0.0
Every release on a timeline
2.x

  1. Not affected

    2.0.0 – 2.5.0

    9 releases, latest

1.x

  1. Affected

    1.0.0 – 1.4.4

    17 releases

0.x

  1. Affected

    0.0.1 – 0.1.8

    15 releases

41 stable releases of multer, oldest to newest, one row per major.

What happens

Impact

Multer <2.0.0 is vulnerable to a resource exhaustion and memory leak issue due to improper stream handling. When the HTTP request stream emits an error, the internal busboy stream is not closed, violating Node.js stream safety guidance.

This leads to unclosed streams accumulating over time, consuming memory and file descriptors. Under sustained or repeated failure conditions, this can result in denial of service, requiring manual server restarts to recover. All users of Multer handling file uploads are potentially impacted.

Patches

Users should upgrade to 2.0.0

Workarounds

None

References