CVE-2026-3520

EUVD-2026-9423
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
expressjsmulter
𝑥
< 2.1.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://cna.openjsf.org/security-advisories.html
https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2
https://www.cve.org/CVERecord?id=CVE-2026-3520