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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.

PUBLISHED Reserved 2026-07-09 | Published 2026-07-10 | Updated 2026-07-14 | Assigner VulnCheck




CRITICAL: 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

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Product status

Default status
unaffected

Any version before 3.9.0
affected

Credits

George Chen finder

References

github.com/Flux159/mcp-server-kubernetes/releases/tag/3.9.0 (Release Notes) release-notes

github.com/Flux159/mcp-server-kubernetes/issues/328 (Researcher Disclosure) exploit technical-description

github.com/Flux159/mcp-server-kubernetes/pull/329 (Pull Request) issue-tracking

github.com/...ommit/d7890f50a4567bf5d9842541ba6f41e180227f9a (Patch Commit) patch

www.vulncheck.com/...-injection-via-kubectl-structured-tools third-party-advisory

cve.org (CVE-2026-61459)

nvd.nist.gov (CVE-2026-61459)

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