CVE-2026-47070

Name: CVE-2026-47070
Creator: NVD / NIST
Published: 2026-05-25T15:16:22.01+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10EPSS 0.35%

Last modified Jun 17, 2026

CVE-2026-47070 is a medium-severity vulnerability rated 6/10 on the CVSS scale. 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. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

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

6.1/10

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

CVSS 4.0

6/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.35%

26.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-601

Affected Software

Vendor	Product	Versions
Benoitc	Hackney	>= 3.1.1, < 4.0.1

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: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-47070?

How severe is CVE-2026-47070?

CVE-2026-47070 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.

How do I fix CVE-2026-47070?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-47070?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST