An exploitable code execution vulnerability exists in the XCF image rendering functionality of Simple DirectMedia Layer SDL2_image-2.0.2. A specially crafted XCF image can cause an out-of-bounds write on the heap, resulting in code execution. An attacker can display a specially crafted image to trigger this vulnerability.
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0521
https://www.starwindsoftware.com/security/sw-20191008-0002/
https://www.debian.org/security/2018/dsa-4184