How to secure your Docker image build pipeline

In a world with increasingly complex technology stacks, security in your Docker build pipeline is critical. Here are the methods we use to harden the entire chain – from base image to registry.

1. Use official base images

Always start with an official image from a trusted organization. Custom or unverified images often carry vulnerabilities you're not aware of.

2. Automate vulnerability and secret scanning

Run Trivy, Grype, or similar tools directly in the pipeline. Let the build fail when critical CVEs are found. Also, scan for leaked secrets with gitleaks or trufflehog.

3. Sign images

Use Cosign or Notary to sign images. The Kubernetes cluster should only accept signed artifacts.

4. Minimize the attack surface

• Multi-stage builds – only necessary binaries in the final image.
• No latest tag in production.
• Run as a non-root user.

5. Protect the registry

Signing + RBAC + immutable tags. Rotate credentials regularly and log everything that is pushed.

Do you want help hardening your pipeline? Our SecOps consultants would be happy to assist you.