libafl

Build a custom fuzzer using a modular Rust library to assemble interchangeable components like observers, mutators, and schedulers into a specialized fuzzing tool. This supports advanced fuzzing strategies tailored to your target.

Yes, you can use this as a drop-in replacement for libFuzzer with minimal setup. It supports acting as a direct substitute while allowing optional advanced customization for target-specific logic and feedback mechanisms.

To compile a custom fuzzer with Rust, you need both the Rust toolchain and LLVM installed. These dependencies are required for proper compilation and instrumentation of your fuzzing targets.

Implement custom mutators and feedback mechanisms by constructing your fuzzer from modular library components. This design enables you to inject novel mutation strategies and target-specific logic into the fuzzing loop.

Use a modular fuzzing library when standard tools cannot handle specific targets, such as novel network protocols. It allows you to build custom fuzzers with specialized mutators and coverage feedback tailored to the protocol's structure.