Ubuntu Security Notice 611-1 – It was discovered that Speex did not properly validate its input when processing Speex file headers. If a user or automated system were tricked into opening a specially crafted Speex file, an attacker could create a denial of service in applications linked against Speex or possibly execute arbitrary code as the user invoking the program.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/66187/USN-611-1.txt
Source: https://packetstormsecurity.com/files/66187/Ubuntu-Security-Notice-611-1.html