A unbound security update has been released for CentOS 7.

CentOS-announce: CESA-2020:2642 Important CentOS 7 unbound Security Update

CentOS Errata and Security Advisory 2020:2642 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:2642

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

x86_64:
1664066f33b5ffb6a1fd8099211332a04ca7a4e431db14135e8e98690fc582ef unbound-1.6.6-5.el7_8.x86_64.rpm
e30d6d4bc2ab1f6e252a2224542df587a6ab89d1002a2208a97f9b20709a5987 unbound-devel-1.6.6-5.el7_8.i686.rpm
ee540a63c08cb4f3f1f9cbb31ed6aafb384759e068538775b84cd90e81a5cd6f unbound-devel-1.6.6-5.el7_8.x86_64.rpm
e968be754e361bfe672d5ae44b63eecdf12bb80c9fda568b616607a04ad38f0e unbound-libs-1.6.6-5.el7_8.i686.rpm
da16632d7149f16e3489b739365d7556eff8615887d95e42973a6a705fcb1ffb unbound-libs-1.6.6-5.el7_8.x86_64.rpm
54808d8a68eb9d59685dc486aa42bda7790ee488beb63004205beee5d337c39e unbound-python-1.6.6-5.el7_8.x86_64.rpm

Source:
d51d4631c5b252cf0cfa4726c980cea159cba977a7a56b7ad4a5ebb9a2706dd1 unbound-1.6.6-5.el7_8.src.rpm