CVE-2026-3520
Multer vulnerable to Denial of Service via uncontrolled recursion
- State
- Published
- Severity
- 8.7 High
- Published
- Mar 4, 2026
- Updated
- Jul 15, 2026
- Reserved
- Mar 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | openjs |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
multerexpressjs |
|
References
- https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2
- https://www.cve.org/CVERecord?id=CVE-2026-3520
- https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
- https://cna.openjsf.org/security-advisories.html
- https://access.redhat.com/security/cve/CVE-2026-3520vdb-entry
- RHBZ#2444584issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3520.json
- https://access.redhat.com/errata/RHSA-2026:6174vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:6802vendor-advisory
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