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.
History

Thu, 05 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important


Thu, 05 Mar 2026 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Expressjs
Expressjs multer
Vendors & Products Expressjs
Expressjs multer

Wed, 04 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 04 Mar 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Title Multer vulnerable to Denial of Service via uncontrolled recursion
Weaknesses CWE-674
References
Metrics cvssV4_0

{'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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published: 2026-03-04T16:17:18.962Z

Updated: 2026-03-04T17:12:25.815Z

Reserved: 2026-03-04T15:27:42.237Z

Link: CVE-2026-3520

cve-icon Vulnrichment

Updated: 2026-03-04T17:12:17.326Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-04T17:16:22.610

Modified: 2026-03-04T18:08:05.730

Link: CVE-2026-3520

cve-icon Redhat

Severity : Important

Publid Date: 2026-03-04T16:17:18Z

Links: CVE-2026-3520 - Bugzilla