CVE-2026-3520

HIGH EPSS 41.8%
Published Mar 4, 20264mo ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
High
Find Similar
Published Mar 4, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
41.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-674

Affected Products 1

VendorProductVersionRange
expressjsmulter* <2.1.1

References 4

  • cna.openjsf.org https://cna.openjsf.org/security-advisories.html
    Third Party Advisory
  • github.com https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
    Patch
  • github.com https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2
    Vendor Advisory
  • cve.org https://www.cve.org/CVERecord?id=CVE-2026-3520
    Third Party Advisory

Remediation

  • github.com https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
    Patch