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Ysoserial is a cyberattack tool for exploiting Java deserialization vulnerabilities. Ysoserial includes a collection of utilities and property-oriented programming “gadget chains” discovered in standard java and .NET libraries that can, under the right conditions, exploit Java and .NET applications performing unsafe deserialization of objects. Ysoserial’s modules are referred to as payloads. Each payload generates a serialized object which once instantiated, invokes some kind of action. Serialization (and the reverse process — deserialization) is a feature of many programming languages that enables developers to convert objects to a unique, binary form for transportation and storage.

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