An unbound security update has been released for CentOS 7.

CESA-2020:2414 Important CentOS 7 unbound Security Update

CentOS Errata and Security Advisory 2020:2414 Important

Upstream details at : https://access.redhat.com/errata/RHSA-2020:2414

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
d7c7de939c7a3dbec81adf688ae2557ca2fc3f18498eb9c09b8896d3b73dd071 unbound-1.6.6-4.el7_8.x86_64.rpm
d253cd8566f10e05e7bbaba91b8985b224760bd9bc95d7be1236a61a2a300846 unbound-devel-1.6.6-4.el7_8.i686.rpm
e08699d98dc4bdc6e3b0420111f4c7a54fd21233dfe55c8b0a966c770023e54f unbound-devel-1.6.6-4.el7_8.x86_64.rpm
75c67d364ea5de70c161e35d62955896b31edafb1314e1338b5ff4d265ec23e4 unbound-libs-1.6.6-4.el7_8.i686.rpm
84862fc5e25c9431d1c50a088469c311a471ecf1f475906b2758ccb65ffe2f20 unbound-libs-1.6.6-4.el7_8.x86_64.rpm
da25fe4519d413260c142ca775e23133ce865ed79ceeb4e60448c1fea9b1ecd0 unbound-python-1.6.6-4.el7_8.x86_64.rpm

Source:
23ffc6fc5c3340e4e55cb79b8da3f80361bd4adcac8215c0cf561dd83738560a unbound-1.6.6-4.el7_8.src.rpm