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CVE-2025-9708

Good to know:

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Date: September 16, 2025

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.

Severity Score

Related Resources (5)

https://nvd.nist.gov/vuln/detail/CVE-2025-9708
https://github.com/kubernetes/kubernetes/issues/134063
https://github.com/kubernetes-client/csharp
https://groups.google.com/g/kubernetes-security-announce/c/rLopt2Msvbw/m/rK6XeNw2CgAJ
https://www.mend.io/vulnerability-database/CVE-2025-9708

Severity Score

Weakness Type (CWE)

Improper Certificate Validation

CWE-295

Top Fix

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Upgrade Version

Upgrade to version KubernetesClient - 17.0.14;KubernetesClient - 17.0.14;KubernetesClient - 17.0.14;https://github.com/kubernetes-client/csharp.git - v17.0.14

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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