CVE-2026-61459: MCP Server Kubernetes before 3.9.0 contains an argument injection vulnerability in structured tools (kubectl_g

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CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-61459 is a critical-severity flaw (CVSS 9.8) affecting mcp-server-kubernetes. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 e

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-88
Published	2026-07-10
Last modified	2026-10-25

Publisher (CNA): VulnCheck · Vendor: suyogs

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-10 19:17 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

suyogs mcp-server-kubernetes UPGRADE

Affected: < 3.9.0

Fixed in: 3.9.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls mcp-server-kubernetes

2. UPGRADE to 3.9.0

npm install mcp-server-kubernetes@">=3.9.0"

Exact fixes by distribution

Python (pip) · mcp-server-kubernetes · FIXED · 3.9.0 · vulnerable: < 3.9.0 · source

pip install --upgrade "mcp-server-kubernetes>=3.9.0" pip show mcp-server-kubernetes

Fedora ELN · nginx-mod-headers-more · FIXED · 0.41-1.eln159 · FEDORA-2026-31f55f396a · source

sudo dnf upgrade --advisory=FEDORA-2026-31f55f396a

Fedora 46 · erlang-hex_core · FIXED · 0.21.1-1.fc46 · FEDORA-2026-f3389199ff · source

sudo dnf upgrade --advisory=FEDORA-2026-f3389199ff

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/Flux159/mcp-server-kubernetes/commit/d7890f50a4567bf5d9842541ba6f41e180227f9a
Write-up: github.com/Flux159/mcp-server-kubernetes/issues/328
Write-up: github.com/Flux159/mcp-server-kubernetes/pull/329
Exploit-DB: mcp-server-kubernetes 3.8.x - Argument Injection

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-61459?

mcp-server-kubernetes: upgrade to 3.9.0. Exact commands for each OS are on this page.

Is CVE-2026-61459 being exploited?

CVE-2026-61459 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-61459 affect?

CVE-2026-61459 affects mcp-server-kubernetes. Severity is critical (CVSS 9.8). 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 resou

How urgent is CVE-2026-61459?

Priority 73/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Kubernetes vulnerabilities

References

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