high8.7
CVE-2026-3520
Multer Vulnerable to Denial of Service via Uncontrolled Recursion
Impact
### Impact A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. ### Patches Users should upgrade to `2.1.1` ### Workarounds None ### Resources - 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
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | multer | < 2.1.1 | 2.1.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Expressjs | Multer | before 2.1.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- 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
- 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
- https://github.com/advisories/GHSA-5528-5vmv-3xc2
- https://nvd.nist.gov/vuln/detail/CVE-2026-3520