Emulator Security

How buffer overflow happens in C sprintf/strcpy and how to fix it

A critical buffer overflow vulnerability was discovered in `mupen64plus-rsp-cxd4/module.c`, where unsafe `sprintf()` and `strcpy()` calls at lines 294–298 could be exploited by a crafted N64 ROM file to corrupt memory and achieve code execution. The fix replaces these unbounded string functions with `snprintf()`, which enforces strict buffer size limits and eliminates the overflow risk. This is a textbook example of how legacy C string functions can silently introduce critical security flaws in