KubernetesClient: Kubernetes C# client accepts certificates from any CA without properly verifying the trust chain
Affects KubernetesClientSource GCVE Database
Not known to be exploited · CVSS 6.8 Medium : upgrade to 17.0.14 when convenient.
Data as of 4 Nov 2026, 18:17 UTC
Thin evidence
One scorer or none| CNA (kubernetes) | CVSS 3.1 | 6.8 |
|---|
- Patch
- Available – fixed in 17.0.14
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 16 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.
What to do
Upgrade KubernetesClient to 17.0.14.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| NuGetKubernetesClient | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade the Kubernetes C# client to version 17.0.14 or later, where the certificate validation flaw has been fixed. Applying this official patch fully mitigates the vulnerability.
Description
The Kubernetes C# client contains a vulnerability in its certificate validation logic that improperly accepts certificates from any Certificate Authority without verifying the trust chain. This flaw could allow attackers to present forged certificates, enabling man-in-the-middle attacks and impersonation of the Kubernetes API server. The issue affects versions prior to 17.0.14 and has been assigned CVE-2025-9708. A patch is available in version 17.0.14 to address this vulnerability.
References
- nvd.nist.gov/vuln/detail/CVE-2025-9708 (opens in a new tab)
- github.com/kubernetes/kubernetes/issues/134063 (opens in a new tab)
- github.com/kubernetes-client/csharp (opens in a new tab)
- groups.google.com/g/kubernetes-security-announce/c/rLopt2Msvbw/m/rK6XeNw2CgAJ (opens in a new tab)
- openwall.com/lists/oss-security/2025/09/16/1 (opens in a new tab)