How Bandit SAST Tool Caught Critical Security Flaws in a FastAPI Python Backend

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A developer applied Bandit, an open-source Static Application Security Testing tool for Python, to audit the backend of VulnScan Pro, a university security engineering project built with FastAPI and approximately 2,410 lines of code. Bandit works by parsing source code into an Abstract Syntax Tree and running security-focused plugins to detect issues such as hardcoded credentials, SQL injection patterns, and insecure cryptography without executing the code. Running the tool against the full backend directory surfaced 58 total issues, including 2 high-severity, 1 medium-severity, and 55 low-severity findings. The article details the exact Bandit commands used, the scan results obtained, and the steps taken to remediate the most critical vulnerability identified. Bandit supports multiple output formats and integrates with CI/CD pipelines and IDEs, making it a practical addition to everyday Python development workflows.

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