USN-3688-1: Spidermonkey vulnerabilities
Multiple memory safety issues were fixed in Spidermonkey. An attacker could potentially exploit these to cause a denial of service, or execute arbitrary code. Available for Ubuntu 18.04 LTS and 17-10

USN-3689-1: Libgcrypt vulnerability
USN-3689-2: Libgcrypt vulnerability
Keegan Ryan discovered that Libgcrypt was susceptible to a side-channel attack. A local attacker could possibly use this attack to recover ECDSA private keys. Available for Ubuntu 18.04 LTS, 16.04 LTS, 17.10, 14.04 LTS, and 12.04 ESM