cfn-nag is a static analysis tool designed to scan AWS CloudFormation templates for security vulnerabilities and misconfigurations. The tool identifies various insecure infrastructure patterns including: - Overly permissive IAM policies and rules - Insecure security group configurations - Missing access logging configurations - Lack of encryption settings - Hardcoded password literals in templates cfn-nag can be installed through multiple package managers including gem and brew, making it accessible across different development environments. The tool supports integration with AWS CodePipeline, enabling automated security scanning as part of continuous integration and deployment workflows. The scanner analyzes CloudFormation template files and provides detailed reports highlighting potential security issues, helping developers and DevOps teams identify and remediate infrastructure security problems before deployment.