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Critical · CVSS 9.8CVE-2026-61459GHSA-WMG3-H8MF-WGVR

mcp-server-kubernetes argument injection can expose Kubernetes cluster credentialsCVE-2026-61459

Answer in brief

CVE-2026-61459 records a Critical severity (CVSS 9.8) vulnerability in mcp-server-kubernetes argument injection can expose Kubernetes cluster credentials. The current sources do not mark it as known exploited. The current feed maps mcp-server-kubernetes (npm), mcp-server-kubernetes (npm), mcp-server-kubernetes (pip), mcp-server-kubernetes (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 10, 2026Updated Oct 28, 2026Source checked Oct 28, 2026First seen by HOL Jul 10, 2026Material review Oct 28, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps mcp-server-kubernetes (npm), mcp-server-kubernetes (npm), mcp-server-kubernetes (pip), mcp-server-kubernetes (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
mcp-server-kubernetesnpm<3.9.03.9.0
mcp-server-kubernetesnpm>=0 <3.9.03.9.0
mcp-server-kubernetespip<3.9.03.9.0
mcp-server-kubernetespypi>=0 <3.9.03.9.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for mcp-server-kubernetes, mcp-server-kubernetes, mcp-server-kubernetes.
  2. 2Review the reported fix. Update mcp-server-kubernetes to 3.9.0; mcp-server-kubernetes to 3.9.0; mcp-server-kubernetes to 3.9.0; mcp-server-kubernetes to 3.9.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Jul 10, 2026

    Evidence: source:ghsa:source_dates:source-dates:record

  2. Source modified

    Oct 28, 2026

    Evidence: source:ghsa:source_dates:source-dates:record

  3. First seen by HOL

    Jul 10, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
  • Source referencevulncheck.com
  • GitHub security advisorygithub.com
  • Source referencepypi.org
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Tool Poisoning
EPSS
Not reported
CWE IDs
CWE-88
Source
GitHub Security Advisories
Source checked
Oct 28, 2026
References
9 linked sources
Open source record