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CVE-2026-102992

CVE-2026-102992 · piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env

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

piscina is a node.js worker pool implementation. Prior to 4.9.4, 5.3.2, and 6.0.0-rc.5, Piscina stores ThreadPool.options in src/index.ts as a plain object that inherits from Object.prototype. Applications with a separate prototype-pollution primitive can therefore supply inherited values for security-sensitive options that do not have own defaults. An inherited execArgv value is passed to the Node.js Worker constructor and can preload attacker-controlled code in worker threads, an inherited loadBalancer function can execute during task scheduling, and inherited env values can alter worker environments. This issue is fixed in versions 4.9.4, 5.3.2, and 6.0.0-rc.5.

CVSS 9.2 · Critical · EPSS 0.5% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • piscina

    Versions
    • < 4.9.4: Affected
    • >= 5.0.0, < 5.3.2: Affected
    • >= 6.0.0-rc.1, < 6.0.0-rc.5: Affected

    No fix published

  • piscina npm

    Affected ranges
    • SEMVER: ≥ 5.0.0, < 5.3.2

    Update to 5.3.2

  • piscina npm

    Affected ranges
    • SEMVER: < 4.9.4

    Update to 4.9.4

  • piscina npm

    Affected ranges
    • SEMVER: ≥ 6.0.0-rc.1, < 6.0.0-rc.5

    Update to 6.0.0-rc.5

Original sources

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