8.8
High
CVE-2026-33943 Happy DOM is a JavaScript implementation of a web browser without its graphical user interface
Description
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. In versions 15.10.0 through 20.8.7, a code injection vulnerability in `ECMAScriptModuleCompiler` allows an attacker to achieve Remote Code Execution (RCE) by injecting arbitrary JavaScript expressions inside `export { }` declarations in ES module scripts processed by happy-dom. The compiler directly interpolates unsanitized content into generated code as an executable expression, and the quote filter does not strip backticks, allowing template literal-based payloads to bypass sanitization. Version 20.8.8 fixes the issue.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| happy-dom 15.10 | 15.10.0 → < 20.8.8 | 20.8.8 |
| Red Hat OpenShift Container Platform 4 | Versions not published | |
| Red Hat Ansible Automation Platform 2 | Versions not published |
References
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
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