# CVE-2022-0759: ruby-kubeclient: A flaw was found in all versions of kubeclient up to (but not including) v4.9.3, the Ruby client for Kubernetes REST...

CVE-2022-0759 is fixed in ruby-kubeclient on 1 platform, first by DEBIAN-CVE-2022-0759, released March 25, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-0759
- Priority: High
- CVSS: 8.1 (high)
- EPSS: 0.0094
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2022

## 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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ruby-kubeclient Debian 12.15 (bookworm) | 4.9.3-1 | [DEBIAN-CVE-2022-0759](https://patchblox.com/security/data/fix/linux/debian-cve-2022-0759.md) | Mar 25, 2022 |
| Linux | ruby-kubeclient Debian 13.5 (trixie) | 4.9.3-1 | [DEBIAN-CVE-2022-0759](https://patchblox.com/security/data/fix/linux/debian-cve-2022-0759.md) | Mar 25, 2022 |
| Linux | ruby-kubeclient Debian 14 | 4.9.3-1 | [DEBIAN-CVE-2022-0759](https://patchblox.com/security/data/fix/linux/debian-cve-2022-0759.md) | Mar 25, 2022 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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