mcp-server-kubernetes argument injection can expose Kubernetes cluster credentials

mcp-server-kubernetes (npm)

MCP Server Kubernetes before 3.9.0 contains an argument injection vulnerability in structured tools (kubectl_get, kubectl_describe, kubectl_delete) that allows attackers to bypass the assertNoDangerousFlags security check by supplying resourceType and name parameters with leading dashes.

Fix it

npm install mcp-server-kubernetes@3.9.0

First seen: 10 Jul 2026
Last update: 10 Jul 2026, 21:32 UTC
Fixed in: mcp-server-kubernetes 3.9.0
Identifiers: CVE-2026-61459
Source: GitHub advisory
On the menu as: npm packages
Kubernetes

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## mcp-server-kubernetes argument injection can expose Kubernetes cluster credentials
Severity: critical. Patch status: patched.
Affected: mcp-server-kubernetes (npm)
Fixed in: mcp-server-kubernetes 3.9.0
Ids: CVE-2026-61459

MCP Server Kubernetes before 3.9.0 contains an argument injection vulnerability in structured tools (kubectl_get, kubectl_describe, kubectl_delete) that allows attackers to bypass the assertNoDangerousFlags security check by supplying resourceType and name parameters with leading dashes.

## Steps
1. Check Dockerfiles, compose files and Kubernetes or Helm manifests for affected images and tags. Report the tag in use and the first fixed tag.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-61459") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/Flux159/mcp-server-kubernetes/commit/d7890f50a4567bf5d9842541ba6f41e180227f9a https://github.com/Flux159/mcp-server-kubernetes/issues/328 https://github.com/Flux159/mcp-server-kubernetes/pull/329 https://github.com/advisories/GHSA-wmg3-h8mf-wgvr https://nvd.nist.gov/vuln/detail/CVE-2026-61459
https://pwned.coffee/i/mcp-server-kubernetes-argument-injection-can-expose-kube-cve-2026-61459

Sources

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