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CVE-2026-34226— Happy DOM's fetch credentials include uses page-origin cookies instead of target-origin cookies

CVSS 7.5 · High EPSS 0.05% · P16
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I. Basic Information for CVE-2026-34226

Vulnerability Information
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Vulnerability Title
Happy DOM's fetch credentials include uses page-origin cookies instead of target-origin cookies
Source: NVD (National Vulnerability Database)
Vulnerability Description
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Versions prior to 20.8.9 may attach cookies from the current page origin (`window.location`) instead of the request target URL when `fetch(..., { credentials: "include" })` is used. This can leak cookies from origin A to destination B. Version 20.8.9 fixes the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过发送数据的信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
happy-dom 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
happy-dom是David Ortner个人开发者的一种没有图形用户界面的 web 浏览器的 JavaScript 实现。 happy-dom 20.8.9之前版本存在安全漏洞，该漏洞源于fetch函数可能附加来自当前页面源的cookie，可能导致cookie泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
capricorn86happy-dom < 20.8.9 -

II. Public POCs for CVE-2026-34226

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8561 chars
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III. Intelligence Information for CVE-2026-34226

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IV. Related Vulnerabilities

Same product: happy-dom
Same vendor: capricorn86
Same weakness: CWE-201

V. Comments for CVE-2026-34226

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