# Kubernetes C# client accepts certificates from any CA without properly verifying the trust chain

Advisory record · `GHSA-w7r3-mgwf-4mqq`

- **Identifiers:** `GHSA-w7r3-mgwf-4mqq` · `CVE-2025-9708`
- **State:** Confirmed
- **Severity:** CVSS 6.8 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-295](https://cwe.mitre.org/data/definitions/295.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md)
- **Published:** 17 Sept 2025
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 17 Sept 2025, 00:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `KubernetesClient` (NuGet): affected `<17.0.14`; fixed in `17.0.14`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The NuGet package KubernetesClient, versions before 17.0.14, accepts certificates from any certificate authority without properly verifying the trust chain. An attacker positioned on the network path could present a forged certificate and intercept or manipulate traffic to the Kubernetes API server, enabling man-in-the-middle attacks and API impersonation. Upgrade to KubernetesClient 17.0.14 or later.

Written 9 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.8 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N`, from CNA (kubernetes)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0031, the 23rd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:21 UTC: First seen by agentprime
- 31 Oct 2026, 15:21 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-w7r3-mgwf-4mqq)

## Sources

- [GitHub Advisory Database: GHSA-w7r3-mgwf-4mqq](https://github.com/advisories/GHSA-w7r3-mgwf-4mqq)
- [OSV: GHSA-w7r3-mgwf-4mqq](https://osv.dev/vulnerability/GHSA-w7r3-mgwf-4mqq)
- <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>
- <http://www.openwall.com/lists/oss-security/2025/09/16/1>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-w7r3-mgwf-4mqq>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-w7r3-mgwf-4mqq/>. Everything for agents: <https://agentprime.io/llms.txt>.