How severe is CVE-2026-33637?

CVE-2026-33637 has a CVSS 3.x base score of 0.0, rated none severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability none.

Is CVE-2026-33637 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33637?

CVE-2026-33637 affects Faraday Project Faraday. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33637?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33637 have an EU (EUVD) identifier?

Yes. CVE-2026-33637 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30966.

When was CVE-2026-33637 published?

CVE-2026-33637 was published on 2026-05-19 and last updated on 2026-06-17.

CVE-2026-33637

CVE-2026-33637 is a none-severity vulnerability in Faraday Project Faraday with a CVSS 3.x base score of 0.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: None (CVSS 3.x base score 0.0)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30966
Weakness: CWE-918
Affected product: Faraday Project Faraday
Published: 2026-05-19
Last modified: 2026-06-17

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.

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.
How severe is CVE-2026-33637?: CVE-2026-33637 has a CVSS 3.x base score of 0.0, rated none severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability none.
Is CVE-2026-33637 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33637?: CVE-2026-33637 affects Faraday Project Faraday. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33637?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33637 have an EU (EUVD) identifier?: Yes. CVE-2026-33637 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30966.
When was CVE-2026-33637 published?: CVE-2026-33637 was published on 2026-05-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:faraday_project:faraday:*:*:*:*:*:*:*:*

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