A denial of service vulnerability was found in subversion. The mod_dontdothat component of the mod_dav_svn Apache module did not properly protect against exponential XML entity expansion attacks. An attacker with credentials to the webdav repository could send a crafted message that would result in resource exhaustion and denial of service to httpd.
A regression was found on RHEL-5.11 making apr-util and httpd vulnerable to billion laughs attack, also known as CVE-2009-1955, again.
Red Hat Product Security has rated this issue as having Moderate security
impact. This issue is not currently planned to be addressed in future
updates. For additional information, refer to the Issue Severity