PostgreSQL 9.6.4 (64-bit)

What's new in this version:

Three security vulnerabilities have been closed by this release:
- CVE-2017-7546: Empty password accepted in some authentication methods
- CVE-2017-7547: The "pg_user_mappings" catalog view discloses passwords to users lacking server privileges
- CVE-2017-7548: lo_put() function ignores ACLs

Bug Fixes and Improvements:
This update also fixes a number of bugs reported in the last few months. Some of these issues affect only version 9.6, but many affect all supported versions:
- pg_upgrade: corrected the documentation about the process for upgrading standby servers to ensure the primary and standbys synchronized safely. Also includes a fix to ensure the last WAL record does not have "wal_level = minimum" which would prevent standbys from connecting upon restart
- Fix for issue with a concurrent locking race condition that could cause some of the updates to fail
- Several fixes for low probability data corruption scenarios
- Fix to prevent crash when sorting more than one billion tuples in-memory
- Fix on Windows to retry creating a process if shared memory addresses could not be allocated, typically caused from antivirus software interference
- Fix in libpq to ensure that failed connection attempts using GSS/SASL and SSPI authentication are reset properly
- Fixes for SSL connection handling and logging
- Fix to allow window functions to be used in sub-SELECT statements that are within the arguments of an aggregate function
- Allow parallelism in the query plan when COPY when copying from a query
- Several fixes to ALTER TABLE
- Fix to ensure that ALTER USER ... SET and ALTER ROLE ... SET accepts the same syntax variants
- Fixes for the statistics collector, ensuring statistics requests made just after a postmaster shutdown request will be written to disk
- Fix possible creation of an invalid WAL segment during standby promotion
- Several walsender / walreceiver fixes, particularly around signal handling and shutdowns / restarts
- Several logic decoding fixes, including removing leakage of small subtransactions to disk
- Allow a CHECK constraints to be initially NOT VALID when executing CREATE FOREIGN TABLE
- Fixes to postgres_fdw for applying changes promptly after ALTER SERVER / ALTER USER MAPPING commands and improving ability to escape from an unresponsive server
- Several fixes for pg_dump and pg_restore, including a fix for pg_dump output to stdout on Windows
- Fix pg_basebackup output to stdout on Windows, similar to the fix for pg_dump
- Fix pg_rewind to correctly handle files exceeding 2GB, though files of such size should rarely appear in a data directory
- Several fixes for building PostgreSQL with Microsoft Visual C (MSVC), primarily around sourcing libraries