🛡️ CVE-2026-34208
🔴 CVSS 10.0 — Critical ✅ No Known Exploit CWE-693 NVD
10.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity CRITICAL
CVSS Score 10.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
CWE CWE-693
Public Exploit ✅ No
Source NVD
Published 2026-04-03
Updated 2026-06-02
Modified 2026-04-06
Fix URL N/A

Affected Packages

Software From version Fixed in
@nyariv/sandboxjs — —
sandboxjs — 0.8.36

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