A cloud-init bugfix update has been released for CentOS 7.

CentOS-announce: CEBA-2020:2654 CentOS 7 cloud-init BugFix Update

CentOS Errata and Bugfix Advisory 2020:2654

Upstream details at :   https://access.redhat.com/errata/RHBA-2020:2654

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

x86_64:
774586985f6797ac1a29a50532b0fc53b8c3a71a8f6585deb3b20a80f98c8089 cloud-init-18.5-6.el7.centos.5.x86_64.rpm

Source:
8ed20a5f94eff19f98b3314cde30ef84c391a53b00cf8c12393e9c359364a08a cloud-init-18.5-6.el7.centos.5.src.rpm