Maintenance and security release of the Drupal 6 series.
This release fixes security vulnerabilities. Sites are urged to upgrade immediately after reading the security announcement:
No other fixes are included.
No changes have been made to the .htaccess, robots.txt or default settings.php files in this release, so upgrading custom versions of those files is not necessary.
Major changes since 6.31:
As of this release, the Drupal form API will automatically sanitize option group labels in select elements. Developers who have implemented forms containing select elements with option groups and who have sanitized the option group labels on their own might therefore find that the labels are double-escaped after this release. The solution is to remove the secondary sanitizing and to rely on the sanitizing provided by Drupal core (similar to other form labels, such as those on individual select element options, which were already sanitized by Drupal core previously).