Recursive loop detection in AWS Lambda, enabled by default, now monitors and stops recursive invocation cycles involving Lambda Event Functions and EventBridge Custom event buses. This enhancement protects users from runaway workloads and unexpected costs caused by misconfigured EventBridge rules triggering continuous recursive Lambda invocations.
Upon detecting loops with EventBridge Custom buses, Lambda stops the recursion and notifies users through the AWS Health Dashboard with troubleshooting guidance. The feature is active in all commercial Regions where EventBridge Custom buses exist and can be disabled per function using a dedicated API for intentional recursion scenarios.
Source & further reading
AWS Lambda recursive loop detection now supports Amazon EventBridge Custom event buses ↗Source published 2026-10-14. 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.