CVE-2026-34208

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, SandboxJS blocks direct assignment to global objects (for example Math.random = ...), but this protection can be bypassed through an exposed callable constructor path: this.constructor.call(target, attackerObject). Because this.constructor resolves to the internal SandboxGlobal function and Function.prototype.call is allowed, attacker code can write arbitrary properties into host global objects and persist those mutations across sandbox instances in the same process. This vulnerability is fixed in 0.8.36.

The following products are affected by CVE-2026-34208 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34208.

URL	Resource
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-2gg9-6p7w-6cpj