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…
High CVSS 7.5
Summary
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.
In-depth triage
No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).
Affected products
- :
Sources
- NVD DATABASE
Original Links
- 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
- https://github.com/capricorn86/happy-dom/releases/tag/v20.8.9 Product
- https://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g Exploit
- 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
Timeline
- nvd_ingest NVD