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CVE-2026-25586— SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution

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 0.8.29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。

CVSS 10.0 · Critical EPSS 0.64% · P48

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes
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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: CVE Program / CVE List V5
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: 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:H
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
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 0.8.29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

Vendor Product Affected Versions CPE Subscribe
nyariv SandboxJS < 0.8.29 -

II. Public POCs for CVE-2026-25586

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III. Intelligence Information for CVE-2026-25586

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Patches & Fixes for CVE-2026-25586 (1)

Vendor Advisories for CVE-2026-25586 (1)

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
Same vendor: nyariv
Same weakness: CWE-74

V. Comments for CVE-2026-25586

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