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CVE-2026-34208— SandboxJS: Sandbox integrity escape

Quick assessment

Affected
nyariv SandboxJS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SandboxJS是nyariv个人开发者的一个安全评估软件。 SandboxJS 0.8.36之前版本存在安全漏洞，该漏洞源于可通过构造函数路径绕过全局对象保护，可能导致修改主机全局对象属性。

CVSS 10.0 · Critical EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-34208

Vulnerability Information
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Vulnerability Title
SandboxJS: Sandbox integrity escape
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5
Vulnerability Title
SandboxJS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SandboxJS是nyariv个人开发者的一个安全评估软件。 SandboxJS 0.8.36之前版本存在安全漏洞，该漏洞源于可通过构造函数路径绕过全局对象保护，可能导致修改主机全局对象属性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
nyariv SandboxJS < 0.8.36 -

II. Public POCs for CVE-2026-34208

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III. Intelligence Information for CVE-2026-34208

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Vendor Advisories for CVE-2026-34208 (1)

Same Patch Batch · nyariv · 2026-04-06 · 3 CVEs total

CVE-2026-34211 SandboxJS: Stack overflow DoS via deeply nested expressions in recursive descent parser
CVE-2026-34217 SandboxJS has a Sandbox Escape via Prop Object Leak in New Handler

IV. Related Vulnerabilities

Same product: SandboxJS
Same vendor: nyariv
Same weakness: CWE-693

V. Comments for CVE-2026-34208

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