A vulnerability has been found and corrected in libxml2:

A denial of service flaw was found in libxml2, a library providing
support to read, modify and write XML and HTML files. A remote attacker
could provide a specially crafted XML file that, when processed by
an application using libxml2, would lead to excessive CPU consumption
(denial of service) based on excessive entity substitutions, even if
entity substitution was disabled, which is the parser default behavior
(CVE-2014-3660).

The updated packages have been patched to correct this issue.