libheif 1.4.0 has a use-after-free in heif::HeifContext::Image::set_alpha_channel in heif_context.h because heif_context.cc mishandles references to non-existing alpha images.
libheif 1.4.0 tiene un uso de memoria después de liberación en heif::HeifContext::Imagen::set_alpha_channel en heif_context.h porque heif_context.cc maneja mal las referencias a imágenes alfa no existentes.
It was discovered that libheif incorrectly handled certain image data. An attacker could possibly use this issue to crash the program, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS. Reza Mirzazade Farkhani discovered that libheif incorrectly handled certain image data. An attacker could possibly use this issue to crash the program, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS.
