Vulnerability Details CVE-2026-47070
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.1%
CVSS Severity
CVSS v3 Score 6.1
References
- https://cna.erlef.org/cves/CVE-2026-47070.html
- https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246
- https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4
- https://osv.dev/vulnerability/EEF-CVE-2026-47070
- https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4
Products affected by CVE-2026-47070
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cpe:2.3:a:benoitc:hackney:3.1.1
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cpe:2.3:a:benoitc:hackney:3.1.2
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cpe:2.3:a:benoitc:hackney:3.2.0
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cpe:2.3:a:benoitc:hackney:3.2.1
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cpe:2.3:a:benoitc:hackney:4.0.0