Please review /etc/httpd/conf.d/drupal6.conf
drupal6-6.26-3.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/drupal6-6.26-3.fc18
Package drupal6-6.26-3.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing drupal6-6.26-3.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-17223/drupal6-6.26-3.fc18 then log in and leave karma (feedback).
drupal6-6.26-4.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/drupal6-6.26-4.fc18
drupal6-6.26-4.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.