A dnsmasq security update has been released for CentOS 7.

CESA-2021:0153 Moderate CentOS 7 dnsmasq Security Update

CentOS Errata and Security Advisory 2021:0153 Moderate

Upstream details at :   https://access.redhat.com/errata/RHSA-2021:0153

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

x86_64:
bbf2b7054c85cc8831c0ffba64a4cabdc3eb23c4d32ba5484b962d4c8f22ecde dnsmasq-2.76-16.el7_9.1.x86_64.rpm
912ce11b5c1438a25af1e1961d891e6421717a57685de5add6d528d3ff3bdf42 dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm

Source:
896b308d212709dca6ffb64bbbec44f0b6747ab3eea831ecf0ae9c9c745b981f dnsmasq-2.76-16.el7_9.1.src.rpm