SDL_image is a library to load images of various formats as SDL surfaces. In do_layer_surface() in src/IMG_xcf.c, pixel index values from decoded XCF tile data are used directly as colormap indices without validating them against the colormap size (cm_num). A crafted .xcf file with a small colormap and out-of-range pixel indices causes heap out-of-bounds reads of up to 762 bytes past the colormap allocation. Both IMAGE_INDEXED code paths are affected (bpp=1 and bpp=2). The leaked heap bytes are written into the output surface pixel data, making them potentially observable in the rendered image. This vulnerability is fixed with commit 996bf12888925932daace576e09c3053410896f8.

SDL3_image-devel-3.4.2-1.1 on GA media

Affected: Ubuntu:Pro:14.04:LTS: libsdl2-image, Ubuntu:Pro:14.04:LTS: sdl-image1.2, Ubuntu:16.04:LTS: libsdl2-image, Ubuntu:16.04:LTS: sdl-image1.2, Ubuntu:18.04:LTS: libsdl2-image, Ubuntu:18.04:LTS: sdl-image1.2, Ubuntu:20.04:LTS: libsdl2-image, Ubuntu:20.04:LTS: sdl-image1.2, Ubuntu:22.04:LTS: libsdl2-image, Ubuntu:22.04:LTS: sdl-image1.2 and 8 more

SDL_image is a library to load images of various formats as SDL surfaces. In do_layer_surface() in src/IMG_xcf.c, pixel index values from decoded XCF tile data are used directly as colormap indices without validating them against the colormap size (cm_num). A crafted .xcf file with a small colormap and out-of-range pixel indices causes heap out-of-bounds reads of up to 762 bytes past the colormap allocation. Both IMAGE_INDEXED code paths are affected (bpp=1 and bpp=2). The leaked heap bytes are written into the output surface pixel data, making them potentially observable in the rendered image. This vulnerability is fixed with commit 996bf12888925932daace576e09c3053410896f8.