Python Security: CVEs, Django & Flask Hardening
Comprehensive Python Security Guide 🆕 Updated November 2, 2026: added a 2026 security advisory table for Python web frameworks covering Flask, FastAPI, Starlette, Tornado, aiohttp, Sanic, Litestar, Werkzeug, Django and Falcon. A practitioner’s defensive reference for securing Python applications — dangerous APIs, deserialization pitfalls, framework-specific risks, supply chain attacks, AI/ML security threats, 2026 CVEs, advanced static analysis, and hardening patterns. Enhanced with cutting-edge threat intelligence and defensive techniques. Table of Contents Fundamentals Dangerous Built-in APIs Insecure Deserialization Command & Code Injection SSRF & URL Parsing in Python Path Traversal, Tarfile, Zipfile Cryptography & Randomness Flask Security Django Security FastAPI & Other Frameworks Jinja2 & Server-Side Template Injection Package Supply Chain Attacks LLM / AI Framework CVEs ML Model Deserialization Attacks Notable Python CVEs (Stdlib) Static Analysis & SAST Secure Coding Patterns Hardening Checklist Tool Reference Detection Quick Reference Python web framework security advisories, 2026 Which of the big Python web frameworks actually had serious advisories this year? I built this table from each project’s GitHub Security Advisories and NVD. Severity is the GitHub-reviewed rating, so NVD’s score can differ. It lists every high or critical advisory published from July 1, 2026 onward, and for the frameworks without one, it says so. ...