eZ publish 3.5 before 3.5.7, 3.6 before 3.6.5, 3.7 before 3.7.3, and 3.8 before 20051128 allows remote authenticated users to cause a denial of service (Apache httpd segmentation fault) via a request to content/advancedsearch.php with an empty SearchContentClassID parameter, reportedly related to a "memory addressing error".
