Jinja2 Sandbox Bypass and Security Hardening Guide

Critical Vulnerability Information 1. Unsafe Attribute Access - - Vulnerability Description: Attempting to access the attribute of a function object is considered unsafe. 2. Security Limitations of Sandbox Environment - A sandbox environment is not a perfect security solution; risks may still exist during code compilation or rendering. - It is possible to construct relatively small templates that cause significant memory consumption, potentially leading to high CPU usage. - Global, filter, and test methods should only be enabled when necessary to prevent potential security issues. 3. Protected Methods - Methods marked with the decorator cannot be called from templates, preventing misuse. - Use to prevent modification of lists and dictionaries. 4. Operator Interception - Binary and unary operators can be intercepted via and settings. - By default, all built-in operators are interceptable, but specific operators can be excluded using the function. 5. Security Check Methods - checks whether an object's attribute is safe to access. - checks whether an object is safe to call. - checks whether an attribute is an internal Python attribute. 6. Custom Operator Behavior - Custom behavior for intercepted operators can be defined by overriding and methods. - Example code demonstrates how to disable the power operator .

Goal Reached Thanks to every supporter — we hit 100%!

Jinja2 Sandbox Bypass and Security Hardening Guide