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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-5528-5vmv-3xc2 Multer Vulnerable to Denial of Service via Uncontrolled Recursion
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published:

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

cve-icon OpenCVE Enrichment

Updated: 2026-03-05T09:08:27Z

Weaknesses