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Java deserialization vulnerabilities have recently gained popularity due to a renewed interest from the security community. Despite being publicly discussed for several years, a significant number of Java based products are still affected. Whenever untrusted data is used within deserialization methods, an attacker can abuse this simple design anti-pattern to compromise your application. After a quick introduction of the problem, this talk will focus on discovering and defending against deserialization vulnerabilities. I will present a collection of techniques for mitigating attacks when turning off object serialization is not an option, and we will discuss practical recommendations that developers can use to help prevent these attacks.