PostgreSQL Improper Access Control Vulnerability - CVE-2019-10130

A vulnerability was found in PostgreSQL versions 11.x up to excluding 11.3 10.x up to excluding 10.8 9.6.x up to excluding 9.6.13 9.5.x up to excluding 9.5.17. PostgreSQL maintains column statistics for tables. Certain statistics such as histograms and lists of most common values contain values taken from the column. PostgreSQL does not evaluate row security policies before consulting those statistics during query planning an attacker can exploit this to read the most common values of certain columns. Affected columns are those for which the attacker has SELECT privilege and for which in an ordinary query row-level security prunes the set of rows visible to the attacker.