A vulnerability has been discovered and corrected in clamav:

Off-by-one error in the cli_hm_scan function in matcher-hash.c in
libclamav in ClamAV before 0.97.2 allows remote attackers to cause
a denial of service (daemon crash) via an e-mail message that is not
properly handled during certain hash calculations (CVE-2011-2721).

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been upgraded to the 0.97.2 version which
is not vulnerable to this issue.