CVE-2025-9708: Kubernetes C# Client: improper certificate validation in custom CA mode may lead to man-in-the-middle attacks

Published Sep 16, 2025
·
Updated

A vulnerability exists in the Kubernetes C# client where the certificate validation logic accepts properly constructed certificates from any Certificate Authority (CA) without properly verifying the trust chain. This flaw allows a malicious actor to present a forged certificate and potentially intercept or manipulate communication with the Kubernetes API server, leading to possible man-in-the-middle attacks and API impersonation.

Affected Software

2 affected componentsFixes available
Kubernetes C# Client
nuget/KubernetesClient<17.0.14
17.0.14

Remediation

Information

Deploy the patch version of the Kubernetes C# client as soon as possible. Alternatively, move the CA certificates into the system trust store instead of specifying them in the kubeconfig file. Note: This approach may introduce new risks, as all processes on the system will begin to trust certificates signed by that CA. If you must use an affected version, you can disable custom CA and add the CA to the machine's trusted root.

Event History

Sep 16, 2025
CVE Published
via MITRE·09:08 PM
Data Sourced
via MITRE·09:08 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·10:15 PM
DescriptionSeverityWeakness
Sep 17, 2025
Advisory Published
via GitHub·12:31 AM
Data Sourced
via GitHub·12:31 AM
DescriptionSeverityWeaknessAffected Software
Feb 27, 57989
Event
via FIRST·09:28 PM
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Frequently Asked Questions

1

What is the severity of CVE-2025-9708?

CVE-2025-9708 has a high severity due to improper certificate validation allowing potential exploitation by attackers.

2

How do I fix CVE-2025-9708?

To fix CVE-2025-9708, ensure that you upgrade to a patched version of the Kubernetes C# client that addresses certificate validation issues.

3

What is the impact of CVE-2025-9708?

The impact of CVE-2025-9708 is that it allows attackers to bypass certificate trust verification, which can lead to security breaches.

4

Which software versions are affected by CVE-2025-9708?

The Kubernetes C# Client is affected by CVE-2025-9708 without specifying particular versions.

5

Who is impacted by CVE-2025-9708?

Users and applications relying on the Kubernetes C# client for secure communications are impacted by CVE-2025-9708.

Company

Resources

Contact

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