{"id":"CVE-2026-47070","aliases":["EEF-CVE-2026-47070","GHSA-h73q-4w9q-82h4"],"url":"https://o3.security/vulnerability/CVE-2026-47070","summary":"HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney","details":"Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackney_h3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request with follow_redirect enabled and includes Authorization or Cookie headers, a server responding with a 3xx redirect to a different host will cause the client to forward those credentials verbatim to the new origin.\n\nThe main hackney.erl module has maybe_strip_auth_on_redirect/2 (guarded by the location_trusted option) to address CVE-2018-1000007, but hackney_h3.erl is missing this protection entirely.\n\nThis issue affects hackney: from 3.1.1 before 4.0.1.","published":"2026-05-25T14:00:46.420Z","modified":"2026-08-12T03:51:12.527746868Z","cvss":null,"epss":{"score":0.00372,"percentile":0.30371,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Hex","name":"hackney","fixedVersion":"4.0.1"}],"fix":{"url":"https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246","label":"benoitc/hackney@c58d5b5"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-47070.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-47070"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47070.json"},{"type":"ADVISORY","url":"https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47070"},{"type":"FIX","url":"https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246"},{"type":"PACKAGE","url":"https://github.com/benoitc/hackney"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:12.527746868Z"}}