CVE-2026-25520

Published February 6th, 2026

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CVSS v3

CRITICAL

CVSS v2

N/A

Affected

PROJECT

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.

nyariv/SandboxJS

Safe eval runtime

GitHub

219