CVE-2026-33637: faraday SSRF — Exploit & Fix

Description

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.

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EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
faraday_project	faraday	2.0.0 — 2.14.2

References

Advisories & Patches

https://github.com/advisories/GHSA-33mh-2634-fwr2 https://github.com/lostisland/faraday/security/advisories/GHSA-5rv5-xj5j-3484 https://github.com/lostisland/faraday/security/advisories/GHSA-5rv5-xj5j-3484

Exploits

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

Frequently Asked Questions

What is CVE-2026-33637? +

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.

What products are affected by CVE-2026-33637? +

CVE-2026-33637 affects products from faraday_project, specifically: faraday. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-33637? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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