Fuzz Testing
Basic AFL++ usage — compile with afl-clang-fast, create a seed corpus, run afl-fuzz — finds bugs. Advanced AFL++ usage finds them 10–100x faster, or finds bugs that basic usage misses entirely. This post covers the techniques that make AFL++ effective against hard targets: persistent mode, comparison logging, custom
AFL++
AFL++ (American Fuzzy Lop++) is the most widely used coverage-guided fuzzer for C and C++ programs. It instruments your binary at compile time to track code coverage, then mutates inputs guided by that coverage to explore your program's logic exhaustively. Used by Google, Mozilla, and security researchers
Fuzz Testing
AFL++ (American Fuzzy Lop Plus Plus) is the most widely used coverage-guided fuzzer in the world. It has discovered thousands of vulnerabilities in production software — from image parsers to network protocols to cryptographic libraries. This tutorial walks you through setting up AFL++, instrumenting a target, building an effective corpus,