CVE-2026-3520

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://cna.openjsf.org/security-advisories.html	Third Party Advisory
https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752	Patch
https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2	Vendor Advisory
https://www.cve.org/CVERecord?id=CVE-2026-3520	Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:6174
https://access.redhat.com/errata/RHSA-2026:6802
https://access.redhat.com/security/cve/CVE-2026-3520
https://bugzilla.redhat.com/show_bug.cgi?id=2444584
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3520.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-03-04 17:16

Updated : 2026-07-15 02:21

NVD link : CVE-2026-3520

Mitre link : CVE-2026-3520

CVE.ORG link : CVE-2026-3520

JSON object : View

Products Affected

expressjs

multer

CWE

CWE-674

Uncontrolled Recursion

CWE-770

Allocation of Resources Without Limits or Throttling

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