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The PostgreSQL Global Development Group has released an update to all supported
versions of our database system, including 10.4, 9.6.9, 9.5.13, 9.4.18, 9.3.23.
This release fixes one security issue as well as several bugs reported over the
last three months. Users should plan to update at the next convenient downtime.

Please see the "Updating" section for post-installation steps for the security
fix and the "incorrect volatility and parallel-safety markings" fix.

Releasenotes: https://www.postgresql.org/about/news/1851/
Security: CVE-2018-1115 Too-permissive access control list on function pg_logfile_rotate()

FreeBSD's port of PostgreSQL uses syslog by default, so the above security
problem is only a problem if you changed the logging configuration. Please
visit the releasenotes linked above and take the actions needed.