CVE-2026-3520: Multer Vulnerable to Denial of Service via Uncontrolled Recursion
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.
References
- cna.openjsf.org/security-advisories.html
- github.com/advisories/GHSA-5528-5vmv-3xc2
- github.com/expressjs/multer
- github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
- github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2
- nvd.nist.gov/vuln/detail/CVE-2026-3520
- www.cve.org/CVERecord?id=CVE-2026-3520
Code Behaviors & Features
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