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CVE-2026-8161

CVE-2026-8161 · multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception

This page contains facts from public vulnerability sources. Check the original advisory before updating.

[email protected] and lower versions are vulnerable to denial of service via uncaught exception. By sending a multipart/form-data request with a field name that collides with an inherited Object.prototype property such as __proto__, constructor, or toString, the parser invokes .push() on the inherited prototype value rather than an array, throwing a TypeError that propagates as an uncaught exception and crashes the process. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: none. Upgrade to [email protected] or higher.

CVSS 7.5 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • multiparty

    Versions
    • ≥ 0, ≤ 4.2.3: Affected (semver)
    • 4.3.0: Not affected (semver)

    Update to 4.3.0

  • node-multiparty Debian:12

    Versions
    • 4.2.3-2
    • 4.2.3-3
    • 4.2.3-4
    • 4.2.3-5
    • 4.3.0+~4.2.1-1
    • 4.3.0-1
    • 4.3.1+~4.2.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Debian:13

    Versions
    • 4.2.3-3
    • 4.2.3-4
    • 4.2.3-5
    • 4.3.0+~4.2.1-1
    • 4.3.0-1
    • 4.3.1+~4.2.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Debian:14

    Versions
    • 4.2.3-3
    • 4.2.3-4
    • 4.2.3-5
    Affected ranges
    • ECOSYSTEM: < 4.3.0-1

    Update to 4.3.0-1

  • multiparty npm

    Affected ranges
    • SEMVER: < 4.3.0

    Update to 4.3.0

  • node-multiparty Ubuntu:16.04:LTS

    Versions
    • 4.0.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Ubuntu:18.04:LTS

    Versions
    • 4.0.0-1
    • 4.0.0-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Ubuntu:20.04:LTS

    Versions
    • 4.2.1-1
    • 4.2.1-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Ubuntu:22.04:LTS

    Versions
    • 4.2.2-2
    • 4.2.2-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Ubuntu:24.04:LTS

    Versions
    • 4.2.3-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Ubuntu:25.10

    Versions
    • 4.2.3-2
    • 4.2.3-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Ubuntu:26.10

    Versions
    • 4.2.3-5
    • 4.3.0+~4.2.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-multiparty Ubuntu:26.04:LTS

    Versions
    • 4.2.3-3
    • 4.2.3-4build1
    • 4.2.3-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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