CVE-2026-25586— SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution
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I. Basic Information for CVE-2026-25586
Vulnerability Information
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Vulnerability Title
SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution
Source: NVD (National Vulnerability Database)
Vulnerability Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: NVD (National Vulnerability Database)
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 0.8.29之前版本存在安全漏洞，该漏洞源于通过在沙箱对象上遮蔽hasOwnProperty可导致沙箱逃逸，从而禁用属性访问路径中的原型白名单强制执行，允许直接访问__proto__和其他被阻止的原型属性，可能导致主机Object.prototype污染和持久的跨沙箱影响。
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
II. Public POCs for CVE-2026-25586
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · nyariv · 2026-02-06 · 4 CVEs total
| CVE-2026-25641 | 10.0 CRITICAL | SandboxJS has a sandbox escape via TOCTOU bug on keys in property accesses |
| CVE-2026-25520 | 10.0 CRITICAL | SandboxJS has a Sandbox Escape |
| CVE-2026-25587 | 10.0 CRITICAL | SandboxJS has a Sandbox Escape |
IV. Related Vulnerabilities
Same product: SandboxJS
- CVE-2026-34217
SandboxJS has a Sandbox Escape via Prop Object Leak in New H - CVE-2026-34211
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SandboxJS: Sandbox integrity escape - CVE-2026-32723
SandboxJS timers have an execution-quota bypass (cross-sandb - CVE-2026-26954
SandboxJS has a Sandbox Escape
Same vendor: nyariv
- CVE-2026-34217
SandboxJS has a Sandbox Escape via Prop Object Leak in New H - CVE-2026-34211
SandboxJS: Stack overflow DoS via deeply nested expressions - CVE-2026-34208
SandboxJS: Sandbox integrity escape - CVE-2026-32723
SandboxJS timers have an execution-quota bypass (cross-sandb - CVE-2026-26954
SandboxJS has a Sandbox Escape
Same weakness: CWE-74
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V. Comments for CVE-2026-25586
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