CVE-2026-33943

Fixed upstream EPSS <1%CVSS 8.8

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.

Published 2026-03-27 · CVE record · OSV

Products: capricorn86 happy-dom, Red Hat Ansible Automation Platform 2, Red Hat OpenShift Container Platform 4

Fixed upstream