Multiple vulnerabilities has been discovered and corrected in
libxml/libxml2:

Integer overflow in xpath.c in libxml2 2.6.x through 2.6.32 and 2.7.x
through 2.7.8, and libxml 1.8.16 and earlier, allows context-dependent
attackers to cause a denial of service (crash) and possibly execute
arbitrary code via a crafted XML file that triggers a heap-based
buffer overflow when adding a new namespace node, related to handling
of XPath expressions (CVE-2011-1944).

The updated packages have been patched to correct this issue.

Update:

Packages were misssing for Mandriva Linux 2011 with the MDVSA-2011:131
advisory which are now being provided.