PT-2026-43067 · Benoitc · Hackney

Benoit Chesneau + 2 · Published 2026-05-25 · Updated 2026-05-25 · CVE-2026-47070

Mitre

CVSS v4.0

6.0

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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.

Fix

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

CVE-2026-47070

Affected Products

Hackney

References · 4

• https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4 · Vendor Advisory
• https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246 · Patch
• https://cna.erlef.org/cves/CVE-2026-47070.html · Note
• https://osv.dev/vulnerability/EEF-CVE-2026-47070 · Note