{"id":"CVE-2026-34226","aliases":["GHSA-w4gp-fjgq-3q4g"],"url":"https://o3.security/vulnerability/CVE-2026-34226","summary":"Happy DOM's fetch credentials include uses page-origin cookies instead of target-origin cookies","details":"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.","published":"2026-03-27T21:17:24.777Z","modified":"2026-07-16T03:31:01.729882022Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"happy-dom","fixedVersion":"20.8.9"}],"fix":{"url":"https://github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda7106e751","label":"capricorn86/happy-dom@68324c2"},"references":[{"type":"WEB","url":"https://github.com/capricorn86/happy-dom/blob/f8d8cad41e9722fab9eefb9dfb3cca696462e908/packages/happy-dom/src/fetch/utilities/FetchRequestHeaderUtility.ts"},{"type":"WEB","url":"https://github.com/capricorn86/happy-dom/releases/tag/v20.8.9"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34226.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-34226"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34226.json"},{"type":"ADVISORY","url":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34226"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2452519"},{"type":"FIX","url":"https://github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda7106e751"},{"type":"FIX","url":"https://github.com/capricorn86/happy-dom/pull/2117"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-16T03:31:01.729882022Z"}}