In mupen64plus v2.6.0 there is an array overflow vulnerability in the write_rdram_regs and write_rdram_regs functions, which enables executing arbitrary commands on the host machine.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.