Semgrep vs Bandit: Python Security Scanning Compared (2026)

Quick Verdict Semgrep and Bandit both scan Python code for security vulnerabilities, but they are fundamentally different tools with different strengths, scopes, and intended audiences. Bandit is a focused, zero-configuration Python security scanner with around 80 built-in test plugins, no learning curve, and instant results. Semgrep is a programmable, multi-language security platform with cross-file taint tracking, custom YAML-based rule authoring, AI-powered triage, and a registry of 20,000+ Pro rules spanning 30+ languages. The comparison matters because Python developers often encounter both tools when building a security scanning pipeline - Bandit appears in virtually every Python security checklist, and Semgrep is increasingly the recommendation for teams that need deeper analysis. Understanding when each is appropriate, and whether you need one or both, is essential for building a security program that actually catches vulnerabilities without overwhelming developers with noise.