High severityNVD Advisory· Published Mar 4, 2026· Updated Mar 4, 2026
Multer vulnerable to Denial of Service via uncontrolled recursion
CVE-2026-3520
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
multernpm | < 2.1.1 | 2.1.1 |
Affected products
4- osv-coords3 versions
< 0.8.2-r7+ 2 more
- (no CPE)range: < 0.8.2-r7
- (no CPE)range: < 3.2.0-r1
- (no CPE)range: < 2.1.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-5528-5vmv-3xc2ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-3520ghsaADVISORY
- cna.openjsf.org/security-advisories.htmlghsaWEB
- github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752ghsaWEB
- github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2ghsaWEB
- www.cve.org/CVERecordghsaWEB
News mentions
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