HIGH

GHSA-5528-5vmv-3xc2

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

Details

### Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

### Patches

Users should upgrade to `2.1.1`

### Workarounds

None

### Resources

- https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2 - https://www.cve.org/CVERecord?id=CVE-2026-3520 - https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752 - https://cna.openjsf.org/security-advisories.html

Are you affected?

Enter the version of the package you're using.

Affected packages

npm / multer

Introduced in: 0 Fixed in: 2.1.1

Fix npm install multer@2.1.1

References

https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2 [WEB]
https://nvd.nist.gov/vuln/detail/CVE-2026-3520 [ADVISORY]
https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752 [WEB]
https://cna.openjsf.org/security-advisories.html [WEB]
https://github.com/expressjs/multer [PACKAGE]
https://www.cve.org/CVERecord?id=CVE-2026-3520 [WEB]