CVE-2026-61459

MCP Server Kubernetes < 3.9.0 Argument Injection via kubectl Structured Tools

9.3 CriticalPublic exploitFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.36%Up 1.9 points since Jul 11, 2026

What each source reports

CVE List Score used 9.3

MCP Server Kubernetes < 3.9.0 Argument Injection via kubectl Structured Tools

Record: CVE-2026-61459
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-88
Updated: 2026-11-02

EUVDEUVD-2026-42987 9.3

Record: EUVD-2026-42987
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-wmg3-h8mf-wgvr 9.3

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

Record: GHSA-wmg3-h8mf-wgvr
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-88
Updated: 2026-11-02

NVD 9.3

Record: CVE-2026-61459
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-88
Updated: 2026-11-02

OSV 9.3

MCP Server Kubernetes < 3.9.0 Argument Injection via kubectl Structured Tools

Record: CVE-2026-61459
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-88
Updated: 2026-11-02

OSVGHSA-wmg3-h8mf-wgvr 9.3

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

Record: GHSA-wmg3-h8mf-wgvr
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-88
Updated: 2026-11-02

OSVPYSEC-2026-3685 9.3

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

Record: PYSEC-2026-3685
CVSS 4.0: 9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`mcp-server-kubernetes` npm	before 3.9.0	3.9.0
`mcp-server-kubernetes` PyPI	before 3.9.0, plus listed versions 0.1.00.1.10.1.20.1.30.1.6	3.9.0

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	mcp-server-kubernetes 3.8.x - Argument Injection	2026-08-11

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-61459 is a critical vulnerability (CVSS 9.3) in Flux159 Mcp-server-kubernetes, published July 10, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 2.36%, the 83rd percentile. Fixed in mcp-server-kubernetes 3.9.0.

References

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