CVE-2026-34208 — SandboxJS: Sandbox integrity escape

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
nyariv / SandboxJS	affected < 0.8.36

CWE

CWE-693, CWE-915

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.