The following updates has been released for CentOS:
CESA-2018:1669 Important CentOS 6 libvirt Security UpdateLibvirt, Ptocps-NG, and Thunderbird Updates for CentOS
CESA-2018:1700 Important CentOS 7 procps-ng Security Update
CESA-2018:1725 Important CentOS 7 thunderbird Security Update
CESA-2018:1726 Important CentOS 6 thunderbird Security Update