An exploitable integer overflow vulnerability exists in the tiff_image_parse functionality of Gdk-Pixbuf 2.36.6 when compiled with Clang. A specially crafted tiff file can cause a heap-overflow resulting in remote code execution. An attacker can send a file or a URL to trigger this vulnerability.
https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0377
https://lists.debian.org/debian-lts-announce/2019/12/msg00025.html