Weakness Type (CWE)

CWE-601 — CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

CAPEC

CVSS 4.0 Score

6

MEDIUM

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

Vulnerability description

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.

Affected

pkg:hex/hackney

Module Source File Routine
hackney_h3 src/hackney_h3.erl hackney_h3:handle_redirect/11
hackney_h3:do_request_with_redirect/8
Status Type Version Changes / Fixed in
affected semver ⓘ 3.1.1 < 4.0.1

pkg:github/benoitc/hackney

Module Source File Routine
hackney_h3 src/hackney_h3.erl hackney_h3:handle_redirect/11
hackney_h3:do_request_with_redirect/8
Status Type Version Changes / Fixed in
affected git ⓘ e61b7d04b7 < c58d5b50ba

References

Credits

  • Finder: Peter Ullrich
  • Remediation developer: Benoit Chesneau
  • Analyst: Jonatan Männchen

CVE record as JSON:  GET /cves/CVE-2026-47070.json
OSV record as JSON:  GET /osv/EEF-CVE-2026-47070.json