CVE-2026-3520

high

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.

References

https://www.cve.org/CVERecord?id=CVE-2026-3520

https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2

https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752

https://cna.openjsf.org/security-advisories.html

Details

Source: Mitre, NVD

Published: 2026-03-04

Updated: 2026-03-04

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 8.7

Vector: 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

Severity: High