Bug 2452519 (CVE-2026-34226) - CVE-2026-34226 happy-dom: Happy DOM: Information disclosure via incorrect cookie handling in fetch requests
Summary: CVE-2026-34226 happy-dom: Happy DOM: Information disclosure via incorrect coo...
Keywords:
Status: NEW
Alias: CVE-2026-34226
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-27 22:02 UTC by OSIDB Bzimport
Modified: 2026-03-30 11:18 UTC (History)
9 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-03-27 22:02:58 UTC 
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.
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