Vulnerability Description
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Expressjs | Multer | < 2.1.1 |
Related Weaknesses (CWE)
References
- https://cna.openjsf.org/security-advisories.htmlThird Party Advisory
- https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2Patch
- https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2Vendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-3520Third Party Advisory
FAQ
What is CVE-2026-3520?
CVE-2026-3520 is a vulnerability with a CVSS score of 7.5 (HIGH). Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed request...
How severe is CVE-2026-3520?
CVE-2026-3520 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3520?
Check the references section above for vendor advisories and patch information. Affected products include: Expressjs Multer.