TI-2026-26018 Aliases CVE-2026-33637 GHSA-5rv5-xj5j-3484

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

HIGH 68CWE-918Published 2026-05-19 · Updated 2026-05-19

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00272 19th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial faraday (RubyGems): 2.14.2Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
lostisland	faraday	2.0.0 – 2.14.2	—	No fix listed	CNA
—	faraday (RubyGems)	2.0.0 to before 2.14.2	2.14.2	Patch available	GHSA-5rv5-xj5j-3484

faraday Vendorlostisland Affected 2.0.0 – 2.14.2 Fixed in — No fix listed CNA
faraday (RubyGems) Vendor— Affected 2.0.0 to before 2.14.2 Fixed in 2.14.2 Patch available GHSA-5rv5-xj5j-3484

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:faraday_project:faraday::::::::	2.0.0 to before 2.14.2	Vulnerable	lostisland

cpe:2.3:a:faraday_project:faraday:*:*:*:*:*:*:*:* Versions 2.0.0 to before 2.14.2 Vulnerable ·lostisland

Remediation

Fix · GHSA-5rv5-xj5j-3484 faraday (RubyGems) Fixed in 2.14.2 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat 3scale API Management Platform 2	Affected	No fix yet: Fix deferred
Red Hat Satellite 6	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-33637
2026-10-03 Alias added: GHSA-5rv5-xj5j-3484

References

Exploit 1

https://github.com/lostisland/faraday/security/advisories/GHSA-5rv5-xj5j-3484

Advisory 2

Other 2

TI-2026-39193 Faraday: Uncontrolled recursion in NestedParamsEncoder allows stack exhaustion DoS via deeply nested query parameters CVSS 3.1HIGH 7.5
TI-2026-20832 Faraday affected by SSRF via protocol-relative URL host override in build_exclusive_url CVSS 3.1MEDIUM 5.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences