CKS Supply Chain Security Practice Question
A security scan report shows that a container image has several high-severity CVEs. The team wants to implement automated scanning in CI/CD pipeline. Which tool would you recommend for scanning container images in a CI pipeline?
⚠ Common exam trap
The CKS exam often tests the distinction between SBOM generation tools (like Syft) and vulnerability scanners (like Trivy), causing candidates to confuse the purpose of each tool in the supply chain security context.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Trivy
Trivy is a comprehensive, open-source vulnerability scanner specifically designed for container images, filesystems, and Git repositories. It integrates seamlessly into CI/CD pipelines, detects high-severity CVEs by cross-referencing image layers against multiple vulnerability databases (e.g., NVD, Red Hat, Alpine), and provides actionable remediation advice. This makes it the correct choice for automated scanning of container images in a CI pipeline.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Syft
Why it's wrong here
Syft generates a software bill of materials by cataloguing packages in an image; it produces no CVE severity findings on its own. It is tempting because it runs against container images in CI, and would be correct when the requirement is SBOM generation or feeding inventory data into a separate vulnerability matcher.
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Checkov
Why it's wrong here
Checkov performs static analysis of infrastructure-as-code templates such as Terraform and CloudFormation; it never pulls image layers or resolves OS package versions against CVE feeds. It is tempting because it integrates into CI, and would be correct for catching misconfigured cloud resources before deployment.
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Kubesec
Why it's wrong here
Kubesec scores Kubernetes YAML manifests for security misconfigurations; it does not inspect image layers or match packages against CVE databases. It is tempting because it runs in CI pipelines, and would be correct when validating deployment manifests for privileged containers, hostPath mounts or missing resource limits.
- ✓
Trivy
Why this is correct
Trivy scans container images for OS package and language dependency vulnerabilities, integrating cleanly into CI pipelines as a CLI step that fails builds on high-severity CVEs. It satisfies the automated scanning requirement without needing a running cluster or registry-side agent, unlike runtime-focused alternatives.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CKS practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKS exam.