Securing container registry images by implementing vulnerability scanning with Trivy and Grype, enforcing image signing with Cosign and Sigstore, configuring registry access controls, and building CI/CD pipelines that prevent deploying unscanned or unsigned images.
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Securing container registry images by implementing vulnerability scanning with Trivy and Grype, enforcing image signing with Cosign and Sigstore, configuring registry access controls, and building CI/CD pipelines that prevent deploying unscanned or unsigned images.
When establishing security controls for container image registries (ECR, ACR, GCR, Docker Hub)
When building CI/CD pipelines that enforce vulnerability scanning before image promotion
When implementing image signing and verification to prevent supply chain attacks
When auditing existing registries for vulnerable, unscanned, or unsigned images
When compliance requires software bill of materials (SBOM) for deployed container images
Do not use for runtime container security (use Falco or Sysdig), for Kubernetes admission control (use OPA Gatekeeper or Kyverno after establishing registry controls), or for host-level vulnerability scanning (use Amazon Inspector or Qualys).
Common Misconfigurations & Verification
Build-time scan only: vuln databases update daily, so an image that passes today gains new CRITICALs later. Enable registry continuous scanning (aws ecr put-image-scanning-configuration --image-scanning-configuration scanOnPush=true, plus enhanced/Inspector) and rescan deployed digests.
Trivy without a failing exit code:trivy image returns 0 even with CRITICALs, so the CI gate passes silently. Use trivy image --exit-code 1 --severity CRITICAL and confirm the pipeline actually fails.
Under-reporting: Trivy skips packages it can't detect (some distroless / custom base images). Cross-check with grype and reconcile package counts against the Syft SBOM.
Signing without enforcement is decorative:cosign sign does nothing unless the cluster verifies. Confirm Kyverno/OPA verifyImages (or cosign verify --key cosign.pub) actually rejects an unsigned image by deploying one.
Mutable tags break provenance: set --image-tag-mutability IMMUTABLE and confirm a re-push of the same tag is rejected.
Keyless verify without pinning:cosign verify must set --certificate-identity and --certificate-oidc-issuer, or any Fulcio-signed image "verifies."
Verify it actually works: push an image with a known CVE and a wrong/absent signature, then confirm (1) the CI gate blocks the promotion and (2) the admission controller denies the pod. Check aws ecr describe-image-scan-findings --query 'imageScanFindings.findingSeverityCounts' reflects the finding.
Prerequisites
Trivy installed (brew install trivy or apt install trivy)
Automated analysis of container image layers to identify known vulnerabilities in OS packages and application dependencies
Image Signing
Cryptographic attestation that verifies the authenticity and integrity of a container image using Cosign or Notation
SBOM
Software Bill of Materials, a comprehensive inventory of software components, libraries, and dependencies in a container image
Tag Immutability
Registry setting that prevents overwriting existing image tags, ensuring that a tag always refers to the same image digest
Sigstore
Open-source project providing keyless signing, transparency logs, and verification tooling for software supply chain security
Image Attestation
Cryptographically signed metadata attached to an image (scan results, SBOM, build provenance) that can be verified before deployment
Tools & Systems
Trivy: Comprehensive vulnerability scanner for container images, filesystems, git repos, and Kubernetes resources
Grype: Anchore's vulnerability scanner with broad vulnerability database coverage for container images and SBOMs
Cosign: Sigstore tool for signing, verifying, and attesting container images with key-based or keyless workflows
Syft: SBOM generation tool supporting SPDX and CycloneDX formats for container images and filesystems
AWS ECR: Container registry with built-in scanning, tag immutability, and lifecycle policies
Common Scenarios
Scenario: Implementing a Secure Image Promotion Pipeline
Context: A development team pushes images to a dev registry without security controls. The security team needs to implement a promotion pipeline that scans, signs, and promotes only approved images to the production registry.
Approach:
Configure ECR scanning on push for the development repository
Add Trivy scanning as a CI/CD gate that blocks images with CRITICAL vulnerabilities
Generate SBOMs with Syft and store alongside image scan results
Sign approved images with Cosign after scanning passes
Configure the production registry to require image signatures for all pushes
Set up Kyverno or OPA Gatekeeper in production Kubernetes to verify signatures before pod creation
Implement lifecycle policies to clean up untagged and old images in both registries
Pitfalls: Vulnerability databases are updated constantly. An image that passes scanning today may have new CRITICAL vulnerabilities discovered tomorrow. Implement continuous scanning of already-deployed images, not just at build time. Image signing keys must be securely stored in KMS or Vault, not in CI/CD environment variables.
Output Format
Container Registry Security Report
=====================================
Registry: 123456789012.dkr.ecr.us-east-1.amazonaws.com
Repositories: 24
Report Date: 2026-02-23
IMAGE INVENTORY:
Total images: 342
Images scanned: 298 (87%)
Images signed: 156 (46%)
Images with SBOM: 134 (39%)
VULNERABILITY SUMMARY:
Critical vulnerabilities: 23 (across 8 images)
High vulnerabilities: 145 (across 34 images)
Medium vulnerabilities: 456 (across 67 images)
Images with no vulns: 89
CRITICAL IMAGES REQUIRING REMEDIATION:
myapp:1.2.3 - 5 CRITICAL (CVE-2026-xxxx in openssl)
api-gateway:2.0.1 - 3 CRITICAL (CVE-2026-yyyy in log4j)
worker:latest - 4 CRITICAL (CVE-2026-zzzz in glibc)
REGISTRY CONFIGURATION:
Scan on push enabled: 18 / 24 repositories
Tag immutability: 12 / 24 repositories
Lifecycle policies: 20 / 24 repositories
Image signing enforced: 8 / 24 repositories
