ysoserial.net vs libformatstr.py: 2026 Comparison
ysoserial.net is a free penetration testing tool. libformatstr.py is a free penetration testing tool. Compare features, ratings, integrations, and community reviews side by side to find the best penetration testing fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
.NET penetration testers and red teamers validating deserialization defenses will find ysoserial.net indispensable; it's the only free payload generator that consistently produces working exploits against ObjectDataProvider, WindowsIdentity, and other high-impact gadget chains without requiring paid commercial alternatives. The tool has 3,544 GitHub stars and remains actively maintained, meaning payloads stay current as .NET frameworks patch old chains. Skip this if your team needs graphical UI workflows or integration with existing Burp/Metasploit pipelines; ysoserial.net is command-line only and demands manual payload delivery.
