CVE-2026-34226

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/capricorn86/happy-dom/blob/f8d8cad41e9722fab9eefb9dfb3cca696462e908/packages/happy-dom/src/fetch/utilities/FetchRequestHeaderUtility.ts	Patch
https://github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda7106e751	Patch
https://github.com/capricorn86/happy-dom/pull/2117	Issue Tracking Patch
https://github.com/capricorn86/happy-dom/releases/tag/v20.8.9	Product Release Notes
https://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g	Exploit Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-34226
https://bugzilla.redhat.com/show_bug.cgi?id=2452519
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34226.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:capricorn86:happy_dom:*:*:*:*:*:node.js:*:*

History

26 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Happy DOM es una implementación de JavaScript de un navegador web sin su interfaz gráfica de usuario. Las versiones anteriores a la 20.8.9 pueden adjuntar cookies del origen de la página actual (’window.location’) en lugar de la URL de destino de la solicitud cuando se utiliza ’fetch(..., { credentials: “include” })’. Esto puede filtrar cookies del origen A al destino B. La versión 20.8.9 corrige el problema.

Information

Published : 2026-03-27 22:16

Updated : 2026-10-26 21:10

NVD link : CVE-2026-34226

Mitre link : CVE-2026-34226

CVE.ORG link : CVE-2026-34226

JSON object : View

Products Affected

capricorn86

happy_dom

CWE

CWE-201

Insertion of Sensitive Information Into Sent Data

CWE-359

Exposure of Private Personal Information to an Unauthorized Actor

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