You can apply the patch yourself. Or you can download the attached file, unzip it and upload it into your /includes folder. (Usual disclaimer: While this file has tested well and performed as expected on our sites, it is offered as-is, with no warranty.)

(Note to our supported hosting clients: Your sites have been updated already.)

If you have yet to do your update from Drupal 4.6.3, you can simply:

1. Backup your site (folders and database), as you always do before a site update;
2. Download Drupal 4.6.4 and unzip the tarball;
3. Replace /includes/common.inc with the unzipped file attached here;
4. Using sftp or shell, upload the files in /modules, /includes and /scripts (as these subfolders contain all the updated files), as well as the changelog.txt. There were no database changes.

That should do it. Be sure to test your site before running off to do other things.

If you're still running Drupal 4.6.2 (or 4.5.5) or an earlier version of Drupal, you really should look at updating. Here's why.