Ruby
CVE-2026-25765
MEDIUM
GHSA-33mh-2634-fwr2
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
Faraday HTTP client library versions before 2.14.1 fail to properly validate protocol-relative URLs when merging user-supplied paths with base URLs, allowing attackers to redirect requests to arbitrary hosts via SSRF attacks. Applications that pass untrusted input to Faraday request methods like get() or post() are vulnerable to request hijacking. A patch is available in version 2.14.1 and later.
Technical ContextAI
Classified as CWE-918 (Server-Side Request Forgery (SSRF)). Affects Faraday. 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 Far
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 2.14.1.. Restrict network access to the affected service where possible.
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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