Cloud Security
Kubernetes and Container Security: A Practical Checklist
The configuration mistakes that most commonly turn a single compromised pod into a full cluster breach.
LOZULA Senior Security Research Team
2026-02-03
8 min read
Key Takeaways for Security Teams
- Container escape techniques matter less than the excessive permissions typically attached to the escaped context.
- Default Kubernetes networking is fully open between pods unless NetworkPolicies say otherwise.
- RBAC audits should be routine, not one-time.
Kubernetes security failures rarely start with a novel exploit, they start with an overprivileged service account, an exposed dashboard, or a container running as root, any of which turns a minor compromise into a cluster-wide one.
Configuration Issues That Enable Escalation
Most real-world Kubernetes compromises trace back to a small set of recurring misconfigurations.
- •Containers running as root with unnecessary Linux capabilities
- •Overly broad RBAC bindings granting service accounts cluster-admin equivalent access
- •Missing NetworkPolicies, allowing any pod to reach any other pod by default
- •Secrets mounted as environment variables instead of properly scoped Secret volumes
A Practical Hardening Checklist
These controls address the majority of real findings without requiring a cluster redesign.
- •Enforce Pod Security Standards (restricted profile) at the namespace level
- •Apply least-privilege RBAC per service account, audited on a regular schedule
- •Segment network traffic with NetworkPolicies between namespaces
- •Scan container images for known vulnerabilities before deployment, not after