CVE-2026-33637CWE-918

Faraday: Protocol-relative URI objects still bypass host scoping (possible incomplete fix for GHSA-33mh-2634-fwr2)

published May 19, 2026

CVSS v3.1
0.0
EPSS
0%
Percentile
20.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
0.0 · NONE
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00294 · 20.9th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-05-19T17:44Z
EPSS history
Timeline
  • 19 MAY 17:44Z
    Faraday: Protocol-relative URI objects still bypass host scoping (possible incomplete fix for GHSA-33mh-2634-fwr2)
    cvelistv5