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CVE-2026-33994

CVE-2026-33994 · Locutus Prototype Pollution due to incomplete fix for CVE-2026-25521

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Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Starting in version 2.0.39 and prior to version 3.0.25, a prototype pollution vulnerability exists in the `parse_str` function of the npm package locutus. An attacker can pollute `Object.prototype` by overriding `RegExp.prototype.test` and then passing a crafted query string to `parse_str`, bypassing the prototype pollution guard. This vulnerability stems from an incomplete fix for CVE-2026-25521. The CVE-2026-25521 patch replaced the `String.prototype.includes()`-based guard with a `RegExp.prototype.test()`-based guard. However, `RegExp.prototype.test` is itself a writable prototype method that can be overridden, making the new guard bypassable in the same way as the original — trading one hijackable built-in for another. Version 3.0.25 contains an updated fix.

CVSS 6.3 · Moyenne · EPSS 0,6% · Correctif disponible

Publication
Mise à jour

Pile logicielle: node

Produits et versions concernés

  • locutus

    Versions du logiciel
    • >= 2.0.39, < 3.0.25: Concernée

    Aucun correctif publié

  • locutus npm

    Plages de versions concernées
    • SEMVER: ≥ 2.0.39, < 3.0.25

    Mettez à jour vers 3.0.25

Sources originales

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