The following updates has been released for CentOS:
CEBA-2018:2163 CentOS 6 dhcp BugFix UpdateDHCP, Firefox, Python, QEMU-KVM, Kernel, GnuPG2 Updates for CentOS
CESA-2018:2112 Critical CentOS 6 firefox Security Update
CESA-2018:2123 Moderate CentOS 7 python Security Update
CESA-2018:2162 Important CentOS 6 qemu-kvm Security Update
CESA-2018:2164 Important CentOS 6 kernel Security Update
CESA-2018:2180 Important CentOS 6 gnupg2 Security Update
CESA-2018:2181 Important CentOS 7 gnupg2 Security Update