Version 8.2.6 contains a variety of fixes to 8.2.5, including fixes for significant security issues. The fixes:

• Prevent functions in indexes from executing with the privileges of the user running VACUUM, ANALYZE.
• Require non-superusers who use /contrib/dblink to use only password authentication, as a security measure.
• Fix PL/Perl to not fail when a UTF-8 regular expression is used in a trusted function.
• Fix PL/Perl to cope when platform's Perl defines type bool as int rather than char.
• Fix PL/Python to work correctly with Python 2.5 on 64-bit machines.
• Make archive recovery always start a new WAL timeline, rather than only when a recovery stop time was used.
• Fix crash of to_tsvector() on huge input strings.

Migrating from Version 8.2.x should not require a datbase dump or restore. If you are migrating from an earlier version, you should consult the PostgreSQL release notes.

You can view the full release notes at http://developer.postgresql.org/pgdocs/postgres/release-8-2-6.html.