Resource exhaustion in multer - CVE-2026-5079

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Main Vulnerability Database Vulnerabilities #VU134533

Resource exhaustion in multer - CVE-2026-5079

Published: June 15, 2026


Vulnerability identifier: #VU134533
CSH Severity: Medium
CVSS v4: 8.7 [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-ID: CVE-2026-5079
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the append-field dependency used by multipart form data processing when parsing deeply nested field names in bracket notation. A remote attacker can send a specially crafted multipart request to cause a denial of service.

A single HTTP request is sufficient to trigger the issue.


Affected software

multer
IBM App Connect Enterprise

How to mitigate CVE-2026-5079

Install security update from vendor's website.

multer - addressed in versions 2.2.0, 3.0.0.2
IBM App Connect Enterprise - addressed in versions 12.0.12.28, 13.0.8.0

External References

Related Security Bulletins