An icu security update has been released for CentOS 6.

CentOS Errata and Security Advisory 2020:0896 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:0896

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

i386:
2ca2af516c855425dff52c4ca4e3d7333751162a57c42f5e5b26684c51cfd4f2 icu-4.2.1-15.el6_10.i686.rpm
061439620ea7c619e47a25c5275c18dce5b7dbe575082783df379a151bb86ac3 libicu-4.2.1-15.el6_10.i686.rpm
4101685dd95347909b98de52c54debc30c15bac854356410773eafbac1cadf02 libicu-devel-4.2.1-15.el6_10.i686.rpm
55f1fdb85073afad06542283b0f271b4b30eb89fd29731bf2123641e4ec4138c libicu-doc-4.2.1-15.el6_10.noarch.rpm

x86_64:
6cd6a6c00d1fe46fe6a6ff4d1b10dc29ce4241e5eac30fcd61eb228d301ad015 icu-4.2.1-15.el6_10.x86_64.rpm
061439620ea7c619e47a25c5275c18dce5b7dbe575082783df379a151bb86ac3 libicu-4.2.1-15.el6_10.i686.rpm
a64311636c7d0ed2c41ee67d3bb3aa7c87dd2b3a14e4032d304e5931fa730c9b libicu-4.2.1-15.el6_10.x86_64.rpm
4101685dd95347909b98de52c54debc30c15bac854356410773eafbac1cadf02 libicu-devel-4.2.1-15.el6_10.i686.rpm
91deb37d9d5bf067ffc12157d580b87784654fc0544a647b5ba3a97c23fec55d libicu-devel-4.2.1-15.el6_10.x86_64.rpm
55f1fdb85073afad06542283b0f271b4b30eb89fd29731bf2123641e4ec4138c libicu-doc-4.2.1-15.el6_10.noarch.rpm

Source:
3e987588a27620f13c18a79ba858a3d8f5a986f1bf9e40e841750e5209050c70 icu-4.2.1-15.el6_10.src.rpm