CVE-2026-3520Multer is a node.js middleware for handling `multipart/form-data`.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-674, CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
expressjs multer expressjs:multer | before 2.1.1 | NVD |
References
- https://cna.openjsf.org/security-advisories.htmlthird-party-advisory
- https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752patch
- https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2026-3520third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:6174
- https://access.redhat.com/errata/RHSA-2026:6802
- https://access.redhat.com/security/cve/CVE-2026-3520
- https://bugzilla.redhat.com/show_bug.cgi?id=2444584
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3520.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.