A vulnerability marked as critical has been reported in Mupen64Plus up to 2.6.0. The affected element is the function
write_is_viewer of the file src/device/cart/is_viewer.c. The manipulation leads to integer overflow.
This vulnerability is traded as CVE-2025-9688. It is possible to initiate the attack remotely. Furthermore, there is an exploit available.
The vendor was contacted early about this disclosure but did not respond in any way.
