CVE-2026-3520 Details
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.
A denial-of-service vulnerability has been identified in Multer, a Node.js middleware for handling multipart/form-data, in versions prior to 2.1.1. The issue allows an attacker to send malformed requests that can cause a stack overflow, leading to a denial-of-service condition. Users are advised to upgrade to version 2.1.1, which includes a patch for this vulnerability. No workarounds are available.
Users should upgrade to Multer version 2.1.1 or later.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2026:6174 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:6802 | redhat-SADP | |
| https://access.redhat.com/security/cve/CVE-2026-3520 | redhat-SADP | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2444584 | redhat-SADP | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3520.json | redhat-SADP | |
| https://cna.openjsf.org/security-advisories.html | openjs | Third Party Advisory |
| https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752 | openjs | Patch |
| https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2 | openjs | Vendor Advisory |
| https://www.cve.org/CVERecord?id=CVE-2026-3520 | openjs | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-674 | Uncontrolled Recursion | openjs |
| CWE-770 | Allocation of Resources Without Limits or Throttling | redhat-SADP |
Affected Products
| Product | Versions |
|---|---|
| expressjs multer | < 2.1.1 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | openjs |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 9, 2026 | Initial Analysis | [email protected] |
| Mar 4, 2026 | New CVE Received | openjs |