This document discusses insecure deserialization exploits. It explains how serialization works by converting objects into a format that can be stored, transmitted, and reconstructed. It notes that while useful for these purposes, serialization with formats like Python Pickle can be insecure if untrusted data is deserialized. It describes how an attacker can leverage __reduce__() to craft a payload that executes remote code if unserialized. The document provides recommendations for detecting, exploiting, and preventing such deserialization attacks.