GitHub Advisoryadvisory · npm
GHSA-5528-5vmv-3xc2 Multer Vulnerable to Denial of Service via Uncontrolled Recursion
HIGH
Official page ↗
- Aliases
- CVE-2026-3520
- Ecosystem
- npm
- Packages
- multer
- Severity
- High
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Weaknesses
- CWE-674
- Reviewed
- 2026-03-05
Affected packages
• npm multer: < 2.1.1 → fixed in 2.1.1
Description
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
Related
Alias · CVE (1)
- CVE-2026-3520 Multer is a node.js middleware for handling `multipart/form-data`. vulnerability
Weakness · CWE (1)
- CWE-674 Uncontrolled Recursion weakness
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