CVE-2025-9708 MEDIUM

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

Vendor Kubernetes
Product Kubernetes CSharp Client
Weakness CWE-295
Published September 16, 2025
Last update November 4, 2025
View on NVD All CVEs

CVSS base score

6.8/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

September 16, 2025 CVE published
November 4, 2025 Record updated