A new updated squid package with the fix for the CVE-2021-28651 within CloudLinux OS 6 ELS has been scheduled for gradual rollout from our production repository.
Rollout slot: 10
Rolled out to: 1%
ETA for 100% rollout: August 3
squid-3.1.23-25.el6.cloudlinux.els
yum update squid*
yum update squid* --enablerepo=cloudlinux-rollout-10-bypass