Vulnerability Description
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Prior to 2.14.1, Faraday's build_exclusive_url method (in lib/faraday/connection.rb) uses Ruby's URI#merge to combine the connection's base URL with a user-supplied path. Per RFC 3986, protocol-relative URLs (e.g. //evil.com/path) are treated as network-path references that override the base URL's host/authority component. This means that if any application passes user-controlled input to Faraday's get(), post(), build_url(), or other request methods, an attacker can supply a protocol-relative URL like //attacker.com/endpoint to redirect the request to an arbitrary host, enabling Server-Side Request Forgery (SSRF). This vulnerability is fixed in 2.14.1.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Faraday Project | Faraday | >= 1.0.0, < 1.10.5 |
Related Weaknesses (CWE)
References
- https://github.com/lostisland/faraday/commit/a6d3a3a0bf59c2ab307d0abd91bc126aef5Patch
- https://github.com/lostisland/faraday/releases/tag/v2.14.1ProductRelease Notes
- https://github.com/lostisland/faraday/security/advisories/GHSA-33mh-2634-fwr2MitigationVendor Advisory
FAQ
What is CVE-2026-25765?
CVE-2026-25765 is a vulnerability with a CVSS score of 5.8 (MEDIUM). Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Prior to 2.14.1, Faraday's build_exclusive_url method (in lib/faraday/connection.rb) uses Ruby'...
How severe is CVE-2026-25765?
CVE-2026-25765 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25765?
Check the references section above for vendor advisories and patch information. Affected products include: Faraday Project Faraday.