Andreas Solberg found a denial of service flaw in how libxml2 processed
certain content. If an application linked against libxml2 processed
such malformed XML content, it could cause the application to stop
responding (CVE-2008-3281).

Update:

The original fix used to correct this issue caused some applications
that used the libxml2 library to crash. These new updated packages
use a different fix that does not cause certain linked applications
to crash as the old packages did.