HighGHSA-5528-5vmv-3xc2CVE-2026-3520
Multer Vulnerable to Denial of Service via Uncontrolled Recursion
Published 5 Mar 2026 · Updated 10 Sept 2026
Affected package
multernpm
- Affected
- <2.1.1
- Fixed in
- 2.1.1
Update to the fixed version for your release line, for example:
npm install multer@2.1.1Details
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
Is GHSA-5528-5vmv-3xc2 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.
References
- Linkgithub.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2
- Advisorynvd.nist.gov/vuln/detail/CVE-2026-3520
- Linkgithub.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
- Linkcna.openjsf.org/security-advisories.html
- Packagegithub.com/expressjs/multer
- Linkwww.cve.org/CVERecord?id=CVE-2026-3520
Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.