An issue was discovered in certain Apple products. GarageBand before 10.1.5 is affected. Logic Pro X before 10.3 is affected. The issue involves the "Projects" component, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted GarageBand project file.
https://support.apple.com/HT207477
https://support.apple.com/HT207476
http://www.talosintelligence.com/reports/TALOS-2016-0262/