CVE-2026-34226
Happy DOM's fetch credentials include uses page-origin cookies instead of target-origin cookies
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 27, 2026
- Updated
- Jul 15, 2026
- Reserved
- Mar 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
happy-domcapricorn86 |
|
References
- https://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g
- https://github.com/capricorn86/happy-dom/pull/2117
- https://github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda7106e751
- https://github.com/capricorn86/happy-dom/blob/f8d8cad41e9722fab9eefb9dfb3cca696462e908/packages/happy-dom/src/fetch/utilities/FetchRequestHeaderUtility.ts
- https://github.com/capricorn86/happy-dom/releases/tag/v20.8.9
- https://access.redhat.com/security/cve/CVE-2026-34226vdb-entry
- RHBZ#2452519issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34226.json
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