Ubuntu Security Notice USN-753-1 – It was discovered that PostgreSQL did not properly handle encoding conversion failures. An attacker could exploit this by sending specially crafted requests to PostgreSQL, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/76411/USN-753-1.txt
Source: https://packetstormsecurity.com/files/76411/Ubuntu-Security-Notice-753-1.html