CVE-2026-34208— SandboxJS: Sandbox integrity escape
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I. Basic Information for CVE-2026-34208
Vulnerability Information
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Vulnerability Title
SandboxJS: Sandbox integrity escape
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
保护机制失效
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 0.8.36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
II. Public POCs for CVE-2026-34208
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- Sandbox integrity escape · Advisory · nyariv/SandboxJS · GitHubx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-34208
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
- 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-2026-32723
SandboxJS timers have an execution-quota bypass (cross-sandb - CVE-2026-26954
SandboxJS has a Sandbox Escape - CVE-2026-25881
@nyariv/sandboxjs has host prototype pollution from sandbox
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-2026-32723
SandboxJS timers have an execution-quota bypass (cross-sandb - CVE-2026-26954
SandboxJS has a Sandbox Escape - CVE-2026-25881
@nyariv/sandboxjs has host prototype pollution from sandbox
Same weakness: CWE-693
- CVE-2026-26956
vm2: WASM Sandbox Escape (Node 25 only) - CVE-2026-24120
vm2: Sandbox Breakout Through Promise Species - CVE-2026-41316
ERB has an @_init deserialization guard bypass via def_modul - CVE-2026-41469
Beghelli Sicuro24 SicuroWeb Missing Content Security Policy - CVE-2026-40604
ClearanceKit: opfilter system extension can be suspended or
V. Comments for CVE-2026-34208
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