AWS eventbridge documentation change

Service: eventbridge · 2026-02-19 · Documentation low

File: eventbridge/latest/userguide/eb-event-patterns-null-values.md

Summary

Added CloudFormation workaround for null values in event patterns

Security assessment

Technical documentation update about template syntax. No security implications identified.

Diff

diff --git a/eventbridge/latest/userguide/eb-event-patterns-null-values.md b/eventbridge/latest/userguide/eb-event-patterns-null-values.md
index 885938394..a07620566 100644
--- a//eventbridge/latest/userguide/eb-event-patterns-null-values.md
+++ b//eventbridge/latest/userguide/eb-event-patterns-null-values.md
@@ -4,0 +5,2 @@
+Using null values in AWS CloudFormation templates
+
@@ -56,0 +59,12 @@ Null values and empty strings are not interchangeable in pattern matching. An ev
+## Using null values in AWS CloudFormation templates
+
+AWS CloudFormation does not allow `null` values in templates. If you define an event pattern with a null value using YAML or JSON object syntax, the template validation fails with the error: `'null' values are not allowed in templates`.
+
+To work around this limitation, specify the `EventPattern` property as a JSON string instead of a YAML or JSON object. The following example shows how to match on null values in a AWS CloudFormation template:
+    
+    
+    MyRule:
+      Type: AWS::Events::Rule
+      Properties:
+        EventPattern: '{"detail":{"responseElements":[null]}}'
+