CNCFExpert Level2026 Updated

Certified Kubernetes Security Specialist Exam Guide 2026: Everything You Need to Pass

Updated May 1, 202612 min readWritten by Certsqill experts

Quick facts — CKS

Exam cost

$395 USD

Questions

15–20 performance tasks

Time limit

2 hours

Passing score

67%

Valid for

2 years

Testing

PSI (browser-based)

Who this exam is for

The Certified Kubernetes Security Specialist certification is designed for professionals who work with or want to work with CNCF technologies in a professional capacity. It is taken by cloud engineers, DevOps practitioners, IT administrators, and technical professionals looking to validate their expertise.

You do not need extensive prior experience to attempt it, but you will benefit from hands-on familiarity with the subject matter. The exam tests applied knowledge and architectural judgment, not just memorization. If you can reason about trade-offs and real-world scenarios, structured practice will handle the rest.

Domain breakdown

The CKS exam is built around official domains, each with a fixed percentage of the question pool. This distribution should directly inform how you allocate your study time.

Domain

Weight

Focus areas

Cluster Setup

10%

Network policies, CIS benchmark hardening, Ingress TLS termination, verifying binary hashes and platform binaries.

Cluster Hardening

15%

RBAC restrictive policies, ServiceAccount token auto-mounting, Kubernetes API server security flags, upgrade practices.

System Hardening

15%

AppArmor profiles, Seccomp profiles, kernel hardening, OS-level restriction, node access minimization.

Minimize Microservice Vulnerabilities

20%

Pod security admission/standards, OPA/Gatekeeper, container sandboxing (gVisor, Kata), mTLS with service meshes.

Supply Chain Security

20%

Image scanning with Trivy, image signing, allowlist registries, Dockerfile best practices, minimal base images.

Monitoring, Logging & Runtime Security

20%

Falco rules for runtime threat detection, audit logging configuration, immutable containers, incident response basics.

Note the domain with the highest weight — many candidates under-invest here because it feels conceptual. In practice, this is where the exam is most precise, with scenario-based questions that test specifics.

What the exam actually tests

This is not a memorization exam. Questions require applied judgment under constraints. Almost every question includes a scenario with explicit requirements and asks you to select the most appropriate solution.

Here are examples of the question types you will encounter:

Falco rule creation

"Write a Falco rule that generates an alert when a process opens a shell inside a container running the image nginx."

Falco rule syntax (rule, desc, condition, output, priority) must be memorized. This appears on almost every CKS exam.

AppArmor and Seccomp

"Apply the AppArmor profile k8s-deny-write to a pod named secure-pod in the production namespace."

Requires knowing the AppArmor annotation format and verifying the profile is loaded on the node before applying it to a pod.

RBAC audit and remediation

"Identify the ServiceAccount that has cluster-admin permissions and remove that ClusterRoleBinding."

Tests ability to query RBAC with kubectl auth can-i --list and identify excessive permissions using kubectl get clusterrolebindings.

How to prepare — 4-week study plan

This plan assumes one hour per weekday and roughly 30 minutes of lighter review on weekends. It is calibrated for someone with some relevant experience. If you are starting from zero, add an extra week before Week 1 to familiarise yourself with the basics.

Week 1: Cluster hardening + RBAC security

CKA prerequisite check: if < 70% on mock CKA, do that first
RBAC audit: kubectl auth can-i, identify and remove over-permissioned bindings
API server hardening: --anonymous-auth=false, --authorization-mode, admission plugins
Network policies: default-deny, allow specific namespaces

Week 2: System hardening + Sandboxing

AppArmor: load profiles with apparmor_parser, apply via annotation
Seccomp: default RuntimeDefault profile, custom profiles, syscall filtering
gVisor/Kata: runtime class configuration, when to use each
Pod Security Admission: enforce/audit/warn modes, baseline vs restricted

Week 3: Supply chain + Runtime security

Trivy: image scan commands, interpret CVE output, know CRITICAL vs HIGH
Falco: rule structure, condition field syntax, test with falco -r
Audit logging: enable apiserver audit, configure policy file, verify events
Image signing basics: cosign concepts, allowlist registries in admission policy

Week 4: Killer.sh timed practice

Killer.sh session 1: full timed attempt — CKS is the hardest Kubernetes exam
Prioritize Falco, AppArmor, and RBAC tasks — they have the highest point weight
Killer.sh session 2: target 70%+
Review all missed tasks — time on the exam is extremely tight

Common mistakes candidates make

These patterns appear repeatedly among candidates who resit this exam. Knowing them in advance is worth several percentage points.

Sitting CKS before being solid on CKA

CKS requires a valid CKA credential and assumes mastery of kubectl, RBAC, and networking. Candidates who passed CKA months ago and have not kept up their kubectl fluency struggle badly. Refresh CKA skills before booking.

Not memorizing Falco rule syntax

Falco appears on every CKS. The condition field (evt.type = execve and container.name contains "nginx") has specific syntax. Write 10 Falco rules from memory before the exam.

Confusing AppArmor and Seccomp configuration paths

AppArmor profiles are loaded on nodes and referenced by name in pod annotations. Seccomp profiles can be loaded from disk at /var/lib/kubelet/seccomp/. The path format and annotation key are different — know both.

Underestimating exam time pressure

CKS tasks are more complex than CKA tasks but the time is the same. Every minute of fumbling with syntax is a minute not spent on the next task. Speed under security tooling constraints requires lab repetition.

Is Certsqill right for you?

Honestly: Certsqill is built for candidates who have already done some studying and want to convert knowledge into exam performance. If you have never touched the subject, start with a foundational course first — then come to Certsqill when you are ready to practice.

Where Certsqill is strong: question depth, AI-powered explanations, and domain analytics. Every question is mapped to the exam blueprint. When you get something wrong, the AI tutor explains why the right answer is right and why each wrong answer fails under the specific constraints in the question.

Where Certsqill is not a replacement: video courses and hands-on labs. Use Certsqill to test and sharpen — not as your first exposure to a topic you have never encountered.

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