Several vulnerabilities were discovered in gdk-pixbuf, the GDK Pixbuf library. CVE-2021-44648 Sahil Dhar reported a heap-based buffer overflow vulnerability when decoding the lzw compressed stream of image data, which may result in the execution of arbitrary code or denial of service if a malformed GIF image is processed. CVE-2021-46829 Pedro Ribeiro reported a heap-based buffer overflow vulnerability when compositing or clearing frames in GIF files, which may result in the execution of arbitrary code or denial of service if a malformed GIF image is processed.