CVE-2025-9708: Kubernetes Csharp Client

Medium severity, CVSS 6.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Kubernetes Kubernetes Csharp Client: up to and including 17.0.13

Published 2025-09-16. Last modified 2026-06-17.