An openjdk security update has been released for CentOS 6.

CentOS-announce: CESA-2020:1506 Important CentOS 6 java-1.8.0-openjdk Security Update

CentOS Errata and Security Advisory 2020:1506 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:1506

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

i386:
63c9188ffdc6721cc1996003a79e8ce4b241e2b377e8f68c42e5f68682ebb16b java-1.8.0-openjdk-1.8.0.252.b09-2.el6_10.i686.rpm
7f6d7d536de0c7f415237ad46563b46d16b4b158a1e6a3d4155c26217d67d9d6 java-1.8.0-openjdk-debug-1.8.0.252.b09-2.el6_10.i686.rpm
f1880a72310e77d4e01fe1ddd0fed3a2db76768d41de211659704b3511bd89cb java-1.8.0-openjdk-demo-1.8.0.252.b09-2.el6_10.i686.rpm
af094b87b04812760a6b394f64da440d36b0c150e4694a1e75a001dd6ff9f806 java-1.8.0-openjdk-demo-debug-1.8.0.252.b09-2.el6_10.i686.rpm
5842002b21825bc2386871c71b160dbe8482bf1d8d0b084c5c8ae70aa46e6abd java-1.8.0-openjdk-devel-1.8.0.252.b09-2.el6_10.i686.rpm
4e164fed38feb19f5fa0c31a7228fde4defa0ee7c7c622c7d047a6d3459c0876 java-1.8.0-openjdk-devel-debug-1.8.0.252.b09-2.el6_10.i686.rpm
76f5e70d78e826491021ff08688cdb244df889bea12e8e22a47d7985dd96a141 java-1.8.0-openjdk-headless-1.8.0.252.b09-2.el6_10.i686.rpm
93a3a8338c202135f2fa05f9d459db0197595db2786dc5139910b9580b66dcf0 java-1.8.0-openjdk-headless-debug-1.8.0.252.b09-2.el6_10.i686.rpm
8bb3fa6c8615fabb2d2d78a5b5250e72c2cae43ee87cf3aea11009d46fdef464 java-1.8.0-openjdk-javadoc-1.8.0.252.b09-2.el6_10.noarch.rpm
80dbfefd8615cf91e047fac0c95ef5c08980778789f400521c9da1d97ae5cfe4 java-1.8.0-openjdk-javadoc-debug-1.8.0.252.b09-2.el6_10.noarch.rpm
d25f08cbfa13f5612ed8bc93232adcbca64ada8d4b28547aea42e63b3cce4350 java-1.8.0-openjdk-src-1.8.0.252.b09-2.el6_10.i686.rpm
669bb82ec974d2a36c11f7d87201c8f18362f7622a3503c70aa816b17cbb7db0 java-1.8.0-openjdk-src-debug-1.8.0.252.b09-2.el6_10.i686.rpm

x86_64:
9384443db1f0daf03f062dc2743810b066e68cd5987b513ae355f4f78f332ac7 java-1.8.0-openjdk-1.8.0.252.b09-2.el6_10.x86_64.rpm
3acdb3c62bcb5a7febc830abdde83751a2d77a58e19f6278da68cf8c52f70d39 java-1.8.0-openjdk-debug-1.8.0.252.b09-2.el6_10.x86_64.rpm
003715ebe5253470a4f9ee79253ec527088765aaaec9d4cb7ae12b423263cb9c java-1.8.0-openjdk-demo-1.8.0.252.b09-2.el6_10.x86_64.rpm
c72aec45b175b906a374c51502276c366ec050cd45ce37870d7c994639838aaf java-1.8.0-openjdk-demo-debug-1.8.0.252.b09-2.el6_10.x86_64.rpm
8277ea0800ef091c2fe6616d4d3533a5c2654a658e9a5a509c93a626ba3fbf5b java-1.8.0-openjdk-devel-1.8.0.252.b09-2.el6_10.x86_64.rpm
938d4a76293716489f3d8ca99fbcd646b414030a9afe45d6b5ae3e3762f634a5 java-1.8.0-openjdk-devel-debug-1.8.0.252.b09-2.el6_10.x86_64.rpm
fca72a2a7a8bc14b9e6bb9bc978ea334536ea3c352e3a76d41702ca2fb5f9478 java-1.8.0-openjdk-headless-1.8.0.252.b09-2.el6_10.x86_64.rpm
920bf5d15d46038abc80814a4a295aacada124ce5ac8d0475097dd0d061a036b java-1.8.0-openjdk-headless-debug-1.8.0.252.b09-2.el6_10.x86_64.rpm
8bb3fa6c8615fabb2d2d78a5b5250e72c2cae43ee87cf3aea11009d46fdef464 java-1.8.0-openjdk-javadoc-1.8.0.252.b09-2.el6_10.noarch.rpm
80dbfefd8615cf91e047fac0c95ef5c08980778789f400521c9da1d97ae5cfe4 java-1.8.0-openjdk-javadoc-debug-1.8.0.252.b09-2.el6_10.noarch.rpm
11b6a40f0090b4a0544613196d39cd7fcd1d2c2b9124ad3d3455ac327bc6fe78 java-1.8.0-openjdk-src-1.8.0.252.b09-2.el6_10.x86_64.rpm
76ccb2ace872a54a85c17663d560049f77e01481e544f29500b384fbe4567669 java-1.8.0-openjdk-src-debug-1.8.0.252.b09-2.el6_10.x86_64.rpm

Source:
69963fd22e56dc0d49bc4b83e8c3b08514241e84da076f2dee5e75b5c2c76698 java-1.8.0-openjdk-1.8.0.252.b09-2.el6_10.src.rpm