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    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.

    Published:Mar 4, 2026
    Last Modified:Apr 17, 2026
    EPS:Mar 4, 2026
    EPSS Score:0.00064
    CVSS Score:7.5

    Affected Products

    Vendor
    Expressjs
    Product
    Multer

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-77063 (CVSS 3.7) — multer is a middleware for handling multipart/form-data in Node.js. When an application uses an asynchronous f…
    CVE-2026-77037 (CVSS 7.5) — multer is a middleware for handling multipart/form-data in Node.js. In version 2.2.0, when a disk-backed uploa…
    CVE-2026-5038 (CVSS 5.3) — Impact: multer versions 2.0.0-alpha.1 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service wh…
    CVE-2026-5079 (CVSS 7.5) — Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply…
    CVE-2026-3304 (CVSS 8.7) — Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version …
    CVE-2026-2359 (CVSS 8.7) — Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High