CVE catalog
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
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.47% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | happy_dom | Not reported | 20.8.9 | fixed |
| Cpe | happy_dom | Not reported | 20.8.9 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | happy_dom | cpe | Not reported | 20.8.9 | Not reported | Not reported | Not reported |
| Cpe | happy_dom | cpe | Not reported | 20.8.9 | Not reported | NVD-CVE-2026-34226 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://access.redhat.com/security/cve/CVE-2026-34226]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2452519]
- [https://github.com/capricorn86/happy-dom/blob/f8d8cad41e9722fab9eefb9dfb3cca696462e908/packages/happy-dom/src/fetch/utilities/FetchRequestHeaderUtility.ts]
- [https://github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda7106e751]
- [https://github.com/capricorn86/happy-dom/pull/2117]
- [https://github.com/capricorn86/happy-dom/releases/tag/v20.8.9]
- [https://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-34226]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34226.json]
[FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX]