mcp-server-kubernetes argument injection can expose Kubernetes cluster credentialsGHSA-wmg3-h8mf-wgvr
CRITICALFix: Flux159/mcp-server-kubernetes#329GHSA-wmg3-h8mf-wgvr is a critical-severity (CVSS 9.8) CWE-88 vulnerability in mcp-server-kubernetes. 1 public exploit reference exists, so weaponization risk is real. A fix is available for mcp-server-kubernetes — see the affected versions and patch details below.
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA’s SSVC triage for GHSA-wmg3-h8mf-wgvr.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-wmg3-h8mf-wgvr by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 384,993 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
mcp-server-kubernetesReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | mcp-server-kubernetes | all versions | 3.9.0pip install --upgrade 'mcp-server-kubernetes==3.9.0' |
Affected Products
mcp-server-kubernetessuyogsResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
mcp-server-kubernetes 3.8.x - Argument Injection
by banyamer · Aug 11, 2026
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mcp-server-kubernetes, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update mcp-server-kubernetes to 3.9.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wmg3-h8mf-wgvr is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is GHSA-wmg3-h8mf-wgvr in your dependencies?
Find it across PyPI, including transitive dependencies.