CVE-2022-0759

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-03-25 · updated 2026-06-17
Weakness: CWE-295

Description

A flaw was found in all versions of kubeclient up to (but not including) v4.9.3, the Ruby client for Kubernetes REST API, in the way it parsed kubeconfig files. When the kubeconfig file does not configure custom CA to verify certs, kubeclient ends up accepting any certificate (it wrongly returns VERIFY_NONE). Ruby applications that leverage kubeclient to parse kubeconfig files are susceptible to Man-in-the-middle attacks (MITM).

Affected products

kubeclient: before 4.9.3 — fixed in 4.9.3

How to fix

Upgrade to a fixed version: kubeclient 4.9.3. Check the vendor advisory for mitigations.

References

https://github.com/ManageIQ/kubeclient/issues/554
https://github.com/ManageIQ/kubeclient/issues/555
https://github.com/ManageIQ/kubeclient/issues/554
https://github.com/ManageIQ/kubeclient/issues/555

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