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

Risk 39
Severity
6.8
EPSS
0.01%
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

Remedy

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.
First published (updated )
CVE-2025-9708

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SecAlerts Pty Ltd.
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info@secalerts.co
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