Vulnerability Description
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Versions 2.0.0 through 2.14.1 still allow protocol-relative host override when the request target is passed as a URI object (rather than a String) to Faraday::Connection#build_exclusive_url. This bypasses the February 2026 fix for GHSA-33mh-2634-fwr2 and enables off-host request forgery: a request built from a fixed-base Faraday::Connection can be redirected to an attacker-controlled host, forwarding connection-scoped values such as Authorization headers and default query parameters. This issue has been fixed in version 2.14.3.
CVSS Score
NONE
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Faraday Project | Faraday | >= 2.0.0, < 2.14.2 |
Related Weaknesses (CWE)
References
- https://github.com/advisories/GHSA-33mh-2634-fwr2Vendor Advisory
- https://github.com/lostisland/faraday/security/advisories/GHSA-5rv5-xj5j-3484ExploitVendor Advisory
- https://github.com/lostisland/faraday/security/advisories/GHSA-5rv5-xj5j-3484ExploitVendor Advisory
FAQ
What is CVE-2026-33637?
CVE-2026-33637 is a vulnerability with a CVSS score of 0.0 (NONE). Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Versions 2.0.0 through 2.14.1 still allow protocol-relative host override when the request targ...
How severe is CVE-2026-33637?
CVE-2026-33637 has been rated NONE with a CVSS base score of 0.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33637?
Check the references section above for vendor advisories and patch information. Affected products include: Faraday Project Faraday.