The get_resource function in repos.c in the mod_dav_svn module in Apache Subversion before 1.7.15 and 1.8.x before 1.8.6 when SVNListParentPath is enabled allows remote attackers to cause a denial of service (crash) via vectors related to the server root and request methods other than GET as demonstrated by the \svn ls http://svn.example.com\ command.