Uncontrolled Recursion in multer - CVE-2026-3520

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Main Vulnerability Database Vulnerabilities #VU128187

Uncontrolled Recursion in multer - CVE-2026-3520

Published: April 27, 2026


Vulnerability identifier: #VU128187
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-2026-3520
CWE-ID: CWE-674
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 recursion in multer when handling malformed requests. A remote attacker can send a specially crafted request to cause a denial of service.

The issue may result in stack overflow.


Affected software

multer
IBM Watson Discovery for IBM Cloud Pak for Data

How to mitigate CVE-2026-3520

Install security update from vendor's website.

multer - update to 2.1.1
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2

External References

Related Security Bulletins