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

Quick assessment

Affected
capricorn86 happy-dom
Exploitation
Public or AI PoC available; prioritize validation
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。

CVSS 7.5 · High EPSS 0.59% · P47

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
capricorn86 happy-dom < 20.8.9 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
capricorn86 happy-dom < 20.8.9 -

II. Public POCs for CVE-2026-34226

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8561 chars
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III. Intelligence Information for CVE-2026-34226

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Patches & Fixes for CVE-2026-34226 (2)

Vendor Advisories for CVE-2026-34226 (1)

Vendor Pages for CVE-2026-34226 (1)

Other References for CVE-2026-34226 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-34226

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