CVE-2026-61459

CRITICAL 9.8

MCP Server Kubernetes < 3.9.0 Argument Injection via kubectl Structured Tools

CVSS Score

9.8

EPSS Score

0.4%

EPSS Percentile

34th

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.

CWE	CWE-88
Vendor	flux159
Product	mcp-server-kubernetes
Published	Jul 10, 2026
Last Updated	Jul 14, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Flux159 / mcp-server-kubernetes

0 < 3.9.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Flux159/mcp-server-kubernetes/releases/tag/3.9.0 github.com: https://github.com/Flux159/mcp-server-kubernetes/issues/328 github.com: https://github.com/Flux159/mcp-server-kubernetes/pull/329 github.com: https://github.com/Flux159/mcp-server-kubernetes/commit/d7890f50a4567bf5d9842541ba6f41e180227f9a vulncheck.com: https://www.vulncheck.com/advisories/mcp-server-kubernetes-argument-injection-via-kubectl-structured-tools

Credits

George Chen