---
title: "CVE-2026-115895: Happy DOM - Remote Code Execution"
description: "Happy DOM 17.0.0 to 21.0.4 contains a remote code execution caused by improper validation of named ESM import aliases in ECMAScriptModuleCompiler.ts, letting attackers execute arbitrary JavaScript in Node.js host, exploit requires enableJavaScriptEvaluation enabled and attacker-controlled HTML or module source."
url: https://panop.io/threat-heartbeat/CVE-2026-115895/
---

# CVE-2026-115895 Happy DOM - Remote Code Execution

Happy DOM 17.0.0 to 21.0.4 contains a remote code execution caused by improper validation of named ESM import aliases in ECMAScriptModuleCompiler.ts, letting attackers execute arbitrary JavaScript in Node.js host, exploit requires enableJavaScriptEvaluation enabled and attacker-controlled HTML or module source.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.56% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115895)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-94](https://cwe.mitre.org/data/definitions/94.html)

## Vendor fix

Update to version 21.0.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-115895](https://nvd.nist.gov/vuln/detail/CVE-2026-115895)
- [https://github.com/capricorn86/happy-dom/releases/tag/v21.0.4](https://github.com/capricorn86/happy-dom/releases/tag/v21.0.4)
- [https://github.com/capricorn86/happy-dom/security/advisories/GHSA-834v-8h66-3h79](https://github.com/capricorn86/happy-dom/security/advisories/GHSA-834v-8h66-3h79)
- [https://github.com/capricorn86/happy-dom/commit/fd163520b74d9fa146be91f7b4e4f46d6cccbe13](https://github.com/capricorn86/happy-dom/commit/fd163520b74d9fa146be91f7b4e4f46d6cccbe13)
- [https://github.com/capricorn86/happy-dom/pull/2537](https://github.com/capricorn86/happy-dom/pull/2537)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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