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Amazon ECR Pull Through Cache Now Supports Referrer Discovery and Sync
Amazon ECR now automatically syncs container image signatures, SBOMs, and attestations through its pull through cache, removing the need for manual retrieval.
What: Amazon Elastic Container Registry's pull through cache feature now automatically discovers and syncs OCI referrers (image signatures, SBOMs, and attestations) from upstream registries into private ECR repositories, where previously these artifacts had to be manually listed and fetched.
Why it matters: This removes friction from security and compliance workflows by making image verification, vulnerability scanning, and supply chain attestation work seamlessly with cached images without requiring custom scripts or client-side workarounds.
Takeaway: Check the Amazon ECR documentation to understand how referrer sync works with your existing pull through cache rules.
Decoder
- OCI referrers: Metadata artifacts linked to container images following the Open Container Initiative specification, such as signatures or security reports\n* SBOM: Software Bill of Materials, a detailed inventory of all components and dependencies in a container image used for security auditing\n* Attestations: Cryptographically signed metadata proving facts about an image, like build provenance or security scan results\n* Pull through cache: A registry feature that automatically mirrors images from upstream registries (like Docker Hub) on first pull and caches them locally
Original article
Amazon Elastic Container Registry now automatically syncs OCI referrers like signatures, SBOMs, and attestations via pull through cache, eliminating manual retrieval and enabling seamless verification workflows across supported AWS regions.
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