An issue was discovered in libSDL2.a in Simple DirectMedia Layer (SDL) 2.0.9 when used in conjunction with libSDL2_image.a in SDL2_image 2.0.4. There is a heap-based buffer overflow in the SDL2_image function IMG_LoadPCX_RW at IMG_pcx.c.
https://usn.ubuntu.com/4238-1/
https://lists.debian.org/debian-lts-announce/2019/07/msg00026.html
https://lists.debian.org/debian-lts-announce/2019/07/msg00021.html