{"id":"cfn-userdata-must-be-base64-encoded","text":"EC2 `UserData` in CloudFormation templates must be Base64-encoded using `!Base64`.","truth_value":"IN","source":"entries/2026/03/11/AWSCloudFormation-latest-UserGuide-gettingstartedwalkthroughhtml.md","source_url":"","source_hash":"60d4a3d65037949f","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"cfn-userdata-must-be-base64-encoded","truth_value":"IN","reason":"premise"}]}}