Fetchmail 6.2.4 and earlier does not properly allocate memory for long lines, which allows remote attackers to cause a denial of service (crash) via a certain email.
https://exchange.xforce.ibmcloud.com/vulnerabilities/13450
http://www.turbolinux.com/security/TLSA-2003-61.txt
http://www.securityfocus.com/bid/8843
http://www.securityfocus.com/advisories/5987
http://www.mandriva.com/security/advisories?name=MDKSA-2003:101