CVE-2026-33994— Locutus 安全漏洞

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

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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

CWE-1321

Locutus 安全漏洞

Locutus是Locutus开源的一个JavaScript代码库。 Locutus 2.0.39至3.0.25之前版本存在安全漏洞，该漏洞源于parse_str函数存在可绕过的原型污染防护，可能导致原型污染攻击。

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