CVE-2026-47070 — HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney

2026-10-08T04:57:29.822972+00:00

Affected: benoitc hackney

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.

The 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.

This issue affects hackney: from 3.1.1 before 4.0.1.

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CVE-2026-47070 — HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney