Drupal 7.3, a maintenance release which fixes security vulnerabilities is now available for download.
Drupal 7.4 also fixes other issues reported through the bug tracking system.
Upgrading your existing Drupal 7 sites is strongly recommended. There are no new features in these releases. For more information about the Drupal 7.x release series, consult the Drupal 7.0 release announcement.
Drupal 7.3 only includes fixes for security issues. Drupal 7.4 also includes bugfixes. The full list of changes between the 7.2 and 7.4 releases can be found by reading the 7.4 release notes. A complete list of all bug fixes in the stable 7.x branch can be found in the git commit log.
Drupal 7.3 was released in response to the discovery of security vulnerabilities. Details can be found in the official security advisory:
To fix the security problem, please upgrade Drupal.
What is included with each release?
We make two versions of Drupal core available, so you can choose to only include security fixes (Drupal 7.3) or security fixes and bugfixes (Drupal 7.4). You can choose your preferred version. We are trying to make it easier and quicker to roll out security updates by making security-only releases available as well as ones with bugfixes included. We hope this helps you roll out the fixes as soon as possible. Read more details in the handbook.
The robots.txt file was changed in Drupal 7 to disallow crawlers from the filter tips pages.
causes node access tests to fail, for people running the full core test suite in the Testing module. Fixed in 7.x-dev, and will be included in the 7.5 release.