Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-E66A5440-7258-11E9-B0E1-6CC21735F730:
The PostgreSQL project reports:
Prior to this release, a user running PostgreSQL 11 can read
arbitrary bytes of server memory by executing a purpose-crafted
INSERT statement to a partitioned table.
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