A heap-based buffer overflow flaw, in SDL while copying an existing surface into a new optimized one, due to a lack of validation while loading a BMP image, is possible. An application that uses SDL to parse untrusted input files may be vulnerable to this flaw, which could allow an attacker to make the application crash or execute code.SDL through 1.2.15 and 2.x through 2.0.9 has a heap-based buffer over-read in BlitNtoN in video/SDL_blit_N.c when called from SDL_SoftBlit in video/SDL_blit.c.A heap-based buffer overflow was discovered in SDL in the SDL_BlitCopy function, that was called while copying an existing surface into a new optimized one, due to lack of validation while loading a BMP image in the SDL_LoadBMP_RW function. An application that uses SDL to parse untrusted input files may be vulnerable to this flaw, which could allow an attacker to make the application crash or possibly execute code.