It was discovered that Exempi incorrectly handled certain media files. If a user or automated system were tricked into opening a specially crafted file, a remote attacker could cause Exempi to hang or crash, resulting in a denial of service, or possibly execute arbitrary code.
Updated packages are now available for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 17.10
Exempi Security Update for Ubuntu
Exempi Security Update for Ubuntu