GHSA-wc9g-mqfw-jrwm

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    GHSA-wc9g-mqfw-jrwm

    Published: 8 Sept 2026Last Modified: 8 Sept 2026

    Summary: multer vulnerable to Denial of Service via crafted multipart field names

    Details: ### Impact A vulnerability in multer allows a remote, unauthenticated attacker to crash the Node.js process with a single `multipart/form-data` request. Two specially crafted text field names cause an uncaught `RangeError: Invalid array length` inside multer's field parsing, which is not routed to the application error handler and terminates the process. All applications using multer to parse multipart requests are affected. ### Patches Users should upgrade to `2.3.0`. ### Workarounds None.

    References: https://github.com/expressjs/multer/security/advisories/GHSA-wc9g-mqfw-jrwm, https://nvd.nist.gov/vuln/detail/CVE-2026-77078, https://github.com/expressjs/multer/commit/87a584e8c8d4da873292635fa1d8c4d78d985b76, https://cna.openjsf.org/security-advisories.html, https://github.com/expressjs/multer, https://github.com/expressjs/multer/releases/tag/v2.3.0

    Affected packages

    Package

    Name: multer

    Purl: pkg:npm/multer

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -2.3.0

    Affected versions

    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