Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Expressjs
  • Multer

No data.

No data.

References
Link Providers
https://cna.openjsf.org/security-advisories.html cve-icon cve-icon cve-icon
https://github.com/expressjs/multer/commit/739919097dde3921ec31b930e4b9025036fa74ee cve-icon cve-icon cve-icon
https://github.com/expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32p cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-3304 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-3304 cve-icon cve-icon cve-icon
History

Tue, 03 Mar 2026 00:15:00 +0000

Type Values Removed Values Added
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

Mon, 02 Mar 2026 12:15:00 +0000

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

Fri, 27 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Fri, 27 Feb 2026 16:00:00 +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 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.
Title Multer vulnerable to Denial of Service via incomplete cleanup
Weaknesses CWE-459
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: 2026-02-27T15:44:37.187Z

Updated: 2026-02-27T17:12:45.375Z

Reserved: 2026-02-26T20:42:41.095Z

Link: CVE-2026-3304

cve-icon Vulnrichment

Updated: 2026-02-27T17:12:37.799Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-27T16:16:26.380

Modified: 2026-03-02T20:30:10.923

Link: CVE-2026-3304

cve-icon Redhat

Severity : Important

Publid Date: 2026-02-27T15:44:37Z

Links: CVE-2026-3304 - Bugzilla