id: PYSEC-2026-3685
published: "2026-08-19T11:56:25.076274Z"
modified: "2026-08-19T12:16:28.926024Z"
aliases:
- CVE-2026-61459
- GHSA-wmg3-h8mf-wgvr
summary: mcp-server-kubernetes argument injection can expose Kubernetes cluster credentials
details: 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. Attackers can inject the --server flag to redirect kubectl commands to an attacker-controlled API server, causing the operator's bearer token to be transmitted externally and enabling full cluster compromise.
affected:
- package:
    name: mcp-server-kubernetes
    ecosystem: PyPI
    purl: pkg:pypi/mcp-server-kubernetes
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 3.9.0
  versions:
  - 0.1.0
  - 0.1.1
  - 0.1.2
  - 0.1.3
  - 0.1.6
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-61459
- type: WEB
  url: https://github.com/Flux159/mcp-server-kubernetes/issues/328
- type: WEB
  url: https://github.com/Flux159/mcp-server-kubernetes/pull/329
- type: WEB
  url: https://github.com/Flux159/mcp-server-kubernetes/commit/d7890f50a4567bf5d9842541ba6f41e180227f9a
- type: PACKAGE
  url: https://github.com/Flux159/mcp-server-kubernetes
- type: WEB
  url: https://github.com/Flux159/mcp-server-kubernetes/releases/tag/3.9.0
- type: WEB
  url: https://www.vulncheck.com/advisories/mcp-server-kubernetes-argument-injection-via-kubectl-structured-tools
- type: PACKAGE
  url: https://pypi.org/project/mcp-server-kubernetes
- type: ADVISORY
  url: https://github.com/advisories/GHSA-wmg3-h8mf-wgvr
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- type: CVSS_V4
  score: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N