Ubuntu Security Notice USN-837-1 – Miroslav Lichvar discovered that Newt incorrectly handled rendering in a text box. An attacker could exploit this and cause a denial of service 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/81604/USN-837-1.txt
Source: https://packetstormsecurity.com/files/81604/Ubuntu-Security-Notice-837-1.html