{"id":"EEF-CVE-2026-47070","summary":"HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney","details":"## Summary\n\nSensitive 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.","aliases":["CVE-2026-47070","GHSA-h73q-4w9q-82h4"],"modified":"2026-05-27T16:00:14.448377733Z","published":"2026-05-25T14:00:46.420Z","database_specific":{"cwe_ids":["CWE-601"],"capec_ids":["CAPEC-37"],"cpe_ids":["cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-47070.html"},{"type":"FIX","url":"https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246"},{"type":"PACKAGE","url":"https://hex.pm/packages/hackney"}],"affected":[{"package":{"name":"hackney","ecosystem":"Hex","purl":"pkg:hex/hackney"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.1.1"},{"fixed":"4.0.1"}]}],"versions":["3.1.1","3.1.2","3.2.0","3.2.1","4.0.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-47070.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/benoitc/hackney","events":[{"introduced":"e61b7d04b7826847e1efe614106ef4d580c78eab"},{"fixed":"c58d5b50bade146360b85caf3dc8065807b08246"}]}],"versions":["4.0.0","3.2.1","3.2.0","3.1.2","3.1.1"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-47070.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Benoit Chesneau","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"ANALYST"}]}