CVE-2026-47070
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
hackneyHex | >= 3.1.1, < 4.0.1 | 4.0.1 |
Affected products
3Patches
Vulnerability mechanics
References
6- cna.erlef.org/cves/CVE-2026-47070.htmlnvdPatchThird Party AdvisoryWEB
- github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246nvdPatchWEB
- osv.dev/vulnerability/EEF-CVE-2026-47070nvdPatchThird Party AdvisoryWEB
- github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4nvdExploitPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-h73q-4w9q-82h4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-47070ghsaADVISORY
News mentions
1- Hackney HTTP Client: Ten CVEs Disclosed in a Single Batch — CRLF Injection, Resource Exhaustion, and MoreVypr Intelligence · May 25, 2026