CVE-2026-91954 [MEDIUM] – FreeRDP before 3.31.0 contains a null pointer dereference vulnerability in gdi_surface_bit

FreeRDP before 3.31.0 contains a null pointer dereference vulnerability in gdi_surface_bits when processing Surface Bits commands with NSCodec codec ID. A malicious RDP server can crash a FreeRDP client by sending a crafted Surface Bits command claiming to use NSCodec, even when the codec is disabled.