fetchmail 6.3.0 and other versions before 6.3.2 allows remote attackers to cause a denial of service (crash) via crafted e-mail messages that cause a free of an invalid pointer when fetchmail bounces the message to the originator or local postmaster.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24265
http://www.vupen.com/english/advisories/2006/3101
http://www.vupen.com/english/advisories/2006/0300
http://www.us-cert.gov/cas/techalerts/TA06-214A.html
http://www.securityfocus.com/bid/19289
http://www.securityfocus.com/bid/16365
http://www.securityfocus.com/archive/1/422936/100/0/threaded
http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.443499
http://securitytracker.com/id?1015527
http://secunia.com/advisories/21253
http://secunia.com/advisories/18895
http://secunia.com/advisories/18571
http://lists.apple.com/archives/security-announce/2006//Aug/msg00000.html
http://fetchmail.berlios.de/fetchmail-SA-2006-01.txt
http://developer.berlios.de/project/shownotes.php?release_id=8784