CVE-2026-33637: Faraday Project Faraday

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Faraday Project Faraday: from 2.0.0, before 2.14.2 (fixed in 2.14.2)

Published 2026-05-19. Last modified 2026-07-24.