Ubuntu Security Notice 931-1 – It was discovered that FFmpeg contained multiple security issues when handling certain multimedia files. If a user were tricked into opening a crafted multimedia file, an attacker could cause a denial of service via application crash, or possibly execute arbitrary code with the privileges of the user invoking the program.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/88652/USN-931-1.txt
Source: https://packetstormsecurity.com/files/88652/Ubuntu-Security-Notice-931-1.html