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kube-bench

kube-bench is an open-source tool that checks whether Kubernetes clusters are deployed according to the security recommendations in the Collective Intelligence System (CIS) Kubernetes Benchmarks (security compliance).

  • Automates checks for CIS Kubernetes Benchmark controls across cluster components (security compliance).
  • Evaluates configuration of Kubernetes master and node components such as Application Programming Interface (API) server, scheduler, controller manager, kubelet, and etcd (infrastructure security).
  • Supports multiple Kubernetes distributions and versions through benchmark configuration files and version-specific test definitions (platform security).
  • Runs as a command-line utility or as a job/pod inside a cluster for scheduled or pipeline-based assessments (DevSecOps automation).
  • Produces detailed reports of passed and failed tests to support remediation and audit workflows (security reporting).

More About kube-bench

kube-bench is an open-source security assessment tool from Aqua Security that evaluates Kubernetes clusters against the Center for Internet Security (CIS) Kubernetes Benchmark (security compliance). The project focuses on configuration-level checks for Kubernetes Control Plane (KCP) and node components, helping organizations align cluster deployments with widely adopted hardening guidance.

The tool implements benchmark tests as YAML-defined checks mapped to CIS controls (security compliance). These checks inspect configuration files, running processes, command-line flags, and permissions for Kubernetes components such as the API server, controller manager, scheduler, kubelet, kube-proxy, and etcd (infrastructure security). kube-bench selects the relevant benchmark version and profile based on the detected Kubernetes version or based on explicit configuration, so that assessments align with the appropriate CIS benchmark release.

kube-bench runs as a command-line application that can be executed directly on Kubernetes nodes or via container images (DevSecOps automation). It can also run as a Kubernetes Job or DaemonSet, which allows operations and security teams to integrate CIS checks into cluster bootstrapping, periodic scans, or Continuous Integration and Continuous Deployment (CI/CD) workflows. The tool outputs structured results that list tests, pass or fail status, and rationales for each control, supporting remediation planning and audit documentation (security reporting).

The project supports multiple environments and distributions, with benchmark definitions and configuration files that cover common Kubernetes installation patterns (platform security). It provides configuration for different benchmark versions and node types, including master, worker, and etcd nodes where applicable, and it allows users to override configuration paths when cluster layouts differ from defaults. This flexibility enables usage across managed Kubernetes services, on-premises (on-prem) clusters, and custom deployments when aligned with the documented benchmarks.

In enterprise environments, kube-bench is used by security engineers, platform teams, and compliance staff to check Kubernetes clusters against CIS guidance as part of broader cloud-native security programs (cloud security). It fits into categories such as infrastructure security auditing, compliance assessment, and Kubernetes hardening, and can complement runtime security, image scanning, and policy enforcement tools from Aqua Security and other vendors. Outputs from kube-bench can feed into security dashboards, ticketing systems, or configuration management workflows, supporting repeatable and documented cluster configuration review.