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Moderate severityNVD Advisory· Published Feb 9, 2026· Updated Feb 10, 2026

Faraday affected by SSRF via protocol-relative URL host override in build_exclusive_url

CVE-2026-25765

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
faradayRubyGems
>= 2.0.0, < 2.14.12.14.1
faradayRubyGems
>= 1.0.0, < 1.10.51.10.5

Affected products

41

Patches

Vulnerability mechanics

References

10

News mentions

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