Fuzzing

How buffer overflow via sprintf happens in C++ fuzzer code and how to fix it

A critical buffer overflow vulnerability was discovered in `prog/fuzzing/recog_basic_fuzzer.cc` where `sprintf` writes to a fixed 256-byte buffer without bounds checking. An attacker providing crafted fuzzer input could exploit this to corrupt memory. The fix replaces `sprintf` with `snprintf`, enforcing the buffer size limit and preventing overflow.