It was discovered that GIMP incorrectly handled certain images. If a user were tricked into opening a specially crafted image, an attacker could possibly use this to execute arbitrary code. (CVE-2017-17784, CVE-2017-17785, CVE-2017-17786, CVE-2017-17787, CVE-2017-17788, CVE-2017-17789)
2.8.10-0ubuntu1.2