CVE-2026-115895

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. From 17.0.0 until 21.0.4, packages/happy-dom/src/module/ECMAScriptModuleCompiler.ts accepts a named ESM import alias without validating that it is a JavaScript binding identifier before inserting it in...

GHSA-834V-8H66-3H79 Happy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code execution

Summary The ESM compiler in [email protected] does not validate imported local binding aliases before interpolating them into generated JavaScript. As a result, an invalid ESM import alias can be transformed into a valid JavaScript destructuring default initializer and executed. This appears to b...

EUVD-2026-109189

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. From 17.0.0 until 21.0.4, packages/happy-dom/src/module/ECMAScriptModuleCompiler.ts accepts a named ESM import alias without validating that it is a JavaScript binding identifier before inserting it in...

CVE-2026-115895 Happy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code execution

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. From 17.0.0 until 21.0.4, packages/happy-dom/src/module/ECMAScriptModuleCompiler.ts accepts a named ESM import alias without validating that it is a JavaScript binding identifier before inserting it in...

CVE-2026-115895

The happy-dom library (versions 17.0.0 through 21.0.4 ) is vulnerable to host code execution due to an incomplete fix for CVE-2026-33943. The flaw exists in packages/happy-dom/src/module/ECMAScriptModuleCompiler.ts, where the compiler fails to validate named ESM import aliases before inserting th...