PostgreSQL 9.1.14 Documentation
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# E.171. Release 7.4.16

> Release Date: 2007-02-05

This release contains a variety of fixes from 7.4.15, including a security fix. For information about new features in the 7.4 major release, see Section E.187.

## E.171.1. Migration to Version 7.4.16

A dump/restore is not required for those running 7.4.X. However, if you are upgrading from a version earlier than 7.4.11, see Section E.176.

## E.171.2. Changes

- Remove security vulnerability that allowed connected users to read backend memory (Tom)

  The vulnerability involves suppressing the normal check that a SQL function returns the data type it's declared to, or changing the data type of a table column used in a SQL function (CVE-2007-0555). This error can easily be exploited to cause a backend crash, and in principle might be used to read database content that the user should not be able to access.

- Fix rare bug wherein btree index page splits could fail due to choosing an infeasible split point (Heikki Linnakangas)

- Fix for rare Assert() crash triggered by `UNION` (Tom)

- Tighten security of multi-byte character processing for UTF8 sequences over three bytes long (Tom)

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