CVE-2026-33637
Faraday has a possible incomplete fix for GHSA-33mh-2634-fwr2: protocol-relative URI objects still bypass host scoping
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | faraday | >= 2.0.0, <= 2.14.1 | 2.14.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Faraday Project | Faraday | from 2.0.0 before 2.14.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-5rv5-xj5j-3484
- https://github.com/lostisland/faraday/security/advisories/GHSA-5rv5-xj5j-3484
- https://github.com/advisories/GHSA-33mh-2634-fwr2
- https://nvd.nist.gov/vuln/detail/CVE-2026-33637
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/faraday/CVE-2026-33637.yml