A squid security update has been released for CentOS 7.

CESA-2022:6815 Important CentOS 7 squid Security Update

CentOS Errata and Security Advisory 2022:6815 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2022:6815

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

x86_64:
1ed3b35b8ed762f11879c5cfa1d97f379a6268de2ed28fb8c9b9c0cfae430cc7 squid-3.5.20-17.el7_9.8.x86_64.rpm
00f44bddea556d6114fd545f221ce9393e2498132e40d8c7e1ba1b4015de0671 squid-migration-script-3.5.20-17.el7_9.8.x86_64.rpm
61a8eaa6a0f98be8585a74fd7663aa37fdb6f542080f0ee3e6b96844e82564a5 squid-sysvinit-3.5.20-17.el7_9.8.x86_64.rpm

Source:
2ed34520d5b850bfa3fd49fea5208a8acd8cc27de9283ca43a05bfba1c5ed8e9 squid-3.5.20-17.el7_9.8.src.rpm