CVE-2025-9708

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.

Score

CVSS 3.1 6.8 Medium

Status

Deferred - jordan@liggitt.net

Published

2025-09-16

Last modified

2025-11-04

Weaknesses

CWE-295

Affected products

• Kubernetes Csharp Client (Kubernetes)

References

• https://github.com/kubernetes/kubernetes/issues/134063
• https://groups.google.com/g/kubernetes-security-announce/c/rLopt2Msvbw/m/rK6XeNw2CgAJ
• http://www.openwall.com/lists/oss-security/2025/09/16/1