html2text.php in Chuggnutt HTML to Text Converter, as used in PHPMailer before 5.2.10, RoundCube Webmail (roundcubemail) 0.2-1.alpha and 0.2-3.beta, Mahara, and AtMail Open 1.03, allows remote attackers to execute arbitrary code via crafted input that is processed by the preg_replace function with the eval switch.
https://www.redhat.com/archives/fedora-package-announce/2008-December/msg00802.html
https://www.redhat.com/archives/fedora-package-announce/2008-December/msg00783.html
https://www.exploit-db.com/exploits/7553
https://www.exploit-db.com/exploits/7549
https://github.com/PHPMailer/PHPMailer/commit/8beacc646acb67c995aea10ac5585970efc7355a
http://www.vupen.com/english/advisories/2008/3419
http://www.vupen.com/english/advisories/2008/3418
http://www.securityfocus.com/archive/1/499489/100/0/threaded
http://www.openwall.com/lists/oss-security/2008/12/12/1
http://sourceforge.net/forum/forum.php?forum_id=898542
http://secunia.com/advisories/34789
http://secunia.com/advisories/33170