CVE-2026-3520
Multer vulnerable to Denial of Service via uncontrolled recursion
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-674 |
| Vendor | expressjs |
| Product | multer |
| Published | Mar 4, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
expressjs / multer
0 < 2.1.1
References
github.com: https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2 cve.org: https://www.cve.org/CVERecord?id=CVE-2026-3520 github.com: https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752 cna.openjsf.org: https://cna.openjsf.org/security-advisories.html access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-3520 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2444584 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3520.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6174 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6802
Credits
🔍 Yuki Matsuhashi Chris de Almeida Ulises Gascón