Mandriva Linux Security Advisory 2010-104 – Unspecified vulnerability in Dovecot 1.2.x before 1.2.11 allows remote attackers to cause a denial of service (CPU consumption) via long headers in an e-mail message. This update provides dovecot 1.2.11 which is not vulnerable to this issue and also holds many bugfixes as well.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/89803/MDVSA-2010-104.txt
Source: https://packetstormsecurity.com/files/89803/Mandriva-Linux-Security-Advisory-2010-104.html