Before this update, organizations using multi-account architectures had to replicate DynamoDB stream data to share events across accounts, adding operational complexity. The new capability, generally available in all AWS Commercial and GovCloud regions by early 2026, permits a Lambda function in one account to be triggered directly from DynamoDB streams in another through resource-based policies.
This enhancement simplifies event-driven architectures, helping centralize processing or share events with partners securely. Access controls ensure only authorized Lambda functions can consume stream data, improving efficiency and reducing infrastructure costs associated with cross-account data flows.
Source & further reading
AWS Lambda announces cross-account access for DynamoDB Streams ↗Source published 2026-01-15. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.