A buffer overflow vulnerability exists in the GIF image parsing functionality of SDL2_image-2.0.2. A specially crafted GIF image can lead to a buffer overflow on a global section. An attacker can display an image to trigger this vulnerability.
https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0499
https://www.debian.org/security/2018/dsa-4184
https://www.debian.org/security/2018/dsa-4177
https://security.gentoo.org/glsa/201903-17
https://lists.debian.org/debian-lts-announce/2018/04/msg00005.html