A squid security update has been released for CentOS 7.

CESA-2022:5542 Important CentOS 7 squid Security Update

CentOS Errata and Security Advisory 2022:5542 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2022:5542

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

x86_64:
7e0f590ddcedeebdbcdd4b72907bb5cb9affb7ffdc5d55c89e57dfc3eae94eb3 squid-3.5.20-17.el7_9.7.x86_64.rpm
3fe92e24b021f0064189e1c7e735a79fffdf4d33994fb8e504bcdbbd19dacb33 squid-migration-script-3.5.20-17.el7_9.7.x86_64.rpm
af7e93ece536de48118743c25ba2dc36958cb213c049a71bf622da7992e28132 squid-sysvinit-3.5.20-17.el7_9.7.x86_64.rpm

Source:
a18b79865c2da4883896084d1d5997ad6c54232c334a322bf4e59faece98dc1d squid-3.5.20-17.el7_9.7.src.rpm