An exploitable code execution vulnerability exists in the XCF image rendering functionality of SDL2_image-2.0.2. A specially crafted XCF image can cause a heap overflow resulting in code execution. An attacker can display a specially crafted image to trigger this vulnerability.
https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0497
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