CVE-2026-47070

MediumCVSS 6.1/10Last modified Jul 24, 2026

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-601

Affected software

Vendor	Product	Versions
benoitc	hackney	>= 3.1.1, < 4.0.1
benoitc	hackney	>= e61b7d04b7826847e1efe614106ef4d580c78eab, < c58d5b50bade146360b85caf3dc8065807b08246

References

https://cna.erlef.org/cves/CVE-2026-47070.htmlPatch, Third Party Advisory
https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246Patch
https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4Exploit, Patch, Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-47070Patch, Third Party Advisory
https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4Exploit, Patch, Vendor Advisory

Timeline

Published: May 25, 2026
Last modified: Jul 24, 2026
NVD status: Analyzed

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