postgresql-11.10-1.aix6.1.ppc.rpm is now available on AIX Toolbox.
This version of postgresql has fixes for the following security vulnerabilities.
CVE-2020-25694
CVE-2020-25695
CVE-2020-25696
You can use YUM to update to this version of package from the AIX Toolbox repository.
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SANGAMESH
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