wireshark is vulnerable to arbitrary code execution. If Wireshark read a malformed packet off a network, it could crash or, possibly, execute arbitrary code as the user running Wireshark.
bugs.wireshark.org/bugzilla/show_bug.cgi?id=2675
lists.opensuse.org/opensuse-security-announce/2008-08/msg00006.html
secunia.com/advisories/31687
secunia.com/advisories/31864
secunia.com/advisories/31886
secunia.com/advisories/32028
secunia.com/advisories/32091
security.gentoo.org/glsa/glsa-200809-17.xml
support.avaya.com/elmodocs2/security/ASA-2008-392.htm
wiki.rpath.com/wiki/Advisories:rPSA-2008-0278
www.mandriva.com/security/advisories?name=MDVSA-2008:199
www.redhat.com/security/updates/classification/#moderate
www.redhat.com/support/errata/RHSA-2008-0890.html
www.securityfocus.com/archive/1/496487/100/0/threaded
www.securitytracker.com/id?1020819
www.vupen.com/english/advisories/2008/2773
www.wireshark.org/docs/relnotes/
www.wireshark.org/security/
www.wireshark.org/security/wnpa-sec-2008-05.html
access.redhat.com/errata/RHSA-2008:0890
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10624
www.redhat.com/archives/fedora-package-announce/2008-September/msg00713.html
www.redhat.com/archives/fedora-package-announce/2008-September/msg00715.html