A squid security update has been released for CentOS 6

CentOS Errata and Security Advisory 2016:1573 Moderate

Upstream details at : https://rhn.redhat.com/errata/RHSA-2016-1573.html

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

i386:
a3dbfd66da87b943696b2a227d69d6e48a6560a02f398d9d8accd1ce9eb06562 squid-3.1.23-16.el6_8.6.i686.rpm

x86_64:
b4453e9f605489d41aae9cad09a4ce96b07be6868c4719b7237b87eccb62a91a squid-3.1.23-16.el6_8.6.x86_64.rpm

Source:
35bed43b9baf4a43b9d7d8d2bccd5e1a98ea071de27d881e100d958e596786fc squid-3.1.23-16.el6_8.6.src.rpm

  CESA-2016:1573 Moderate CentOS 6 squid Security Update