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

Quick assessment

Affected
capricorn86 happy-dom
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Happy DOM 是一个不带图形用户界面的 Web 浏览器 JavaScript 实现。在 17.0.0 至 21.0.4 版本中， 模块在将命名 ESM 导入别名插入生成的解构绑定之前，未验证该别名是否为合法的 JavaScript 绑定标识符。当启用了 选项时，攻击者可控制的 HTML 或模块源代码可利用无效的别名，使其在编译后变为有效的默认初始化器，从而导致生成的 JavaScript 代码在 Node.js 宿主进程中执行。已验证的利用路径使用了 JSON 模块的导入属性，该属性可防止恶意别名在后续的 E

CVSS 8.8 · High
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I. Basic Information for CVE-2026-115895

Vulnerability Information
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Vulnerability Title
Happy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code execution
Source: CVE Program / CVE List V5
Vulnerability Description
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 into a generated destructuring binding. With enableJavaScriptEvaluation enabled, attacker-controlled HTML or module source can use an invalid alias that becomes a valid default initializer after compilation, causing the generated JavaScript to execute in the Node.js host process. The demonstrated reachable path uses a JSON module import attribute, which prevents the malicious alias from being emitted again in a later ESM circular-import assignment and keeps the generated function syntactically valid. This incomplete fix for CVE-2026-33943 is a distinct residual path because the earlier remediation validated the local export importName path but not the named-import alias. This issue is fixed in version 21.0.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
capricorn86 happy-dom >= 17.0.0, < 21.0.4 -

II. Public POCs for CVE-2026-115895

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III. Intelligence Information for CVE-2026-115895

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Patches & Fixes for CVE-2026-115895 (2)

Vendor Pages for CVE-2026-115895 (1)

IV. Related Vulnerabilities

Same product: happy-dom
Same vendor: capricorn86
Same weakness: CWE-94

V. Comments for CVE-2026-115895

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