The unmew11 function in libclamav/mew.c in libclamav in ClamAV before 0.92.1 has unknown impact and attack vectors that trigger "heap corruption."
https://exchange.xforce.ibmcloud.com/vulnerabilities/40474
http://www.vupen.com/english/advisories/2008/0924/references
http://www.vupen.com/english/advisories/2008/0606
http://www.vupen.com/english/advisories/2008/0503
http://www.mandriva.com/security/advisories?name=MDVSA-2008:088
http://support.novell.com/techcenter/psdb/512985d2cd3090bfb93dcb7b551179cf.html
http://sourceforge.net/project/shownotes.php?release_id=575703
http://security.gentoo.org/glsa/glsa-200802-09.xml
http://secunia.com/advisories/29420
http://secunia.com/advisories/29060
http://secunia.com/advisories/29048
http://secunia.com/advisories/29026
http://secunia.com/advisories/29001
http://secunia.com/advisories/28907
http://lists.opensuse.org/opensuse-security-announce/2008-02/msg00008.html
http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html
http://kolab.org/security/kolab-vendor-notice-19.txt