by Kastro
Paper/Archive/CVE-2026-61459

CVE-2026-61459

Flux159 mcp-server-kubernetes — MCP Server Kubernetes < 3.9.0 Argument Injection via kubectl Structured Tools

EPSS 2%public exploitCVSS 9.8
critical.is priorityof 100
56
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 83.8.838 × 2016.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
mcp-server-kubernetes< 3.9.03.9.0CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refgithub.com/Flux159/mcp-server-kubernetes/releases/tag/3.9.0exploitgithub.com/Flux159/mcp-server-kubernetes/issues/328refgithub.com/Flux159/mcp-server-kubernetes/pull/329patchgithub.com/Flux159/mcp-server-kubernetes/commit/d7890f50a4567bf5d9842541ba6f41e180227f9awriteupvulncheck.com/advisories/mcp-server-kubernetes-argument-injection-via-kubectl-structured-tools