CVE-2015-7686

Algorithmic complexity vulnerability in Address.pm in the Email-Address
module 1.908 and earlier for Perl allows remote attackers to cause a denial
of service (CPU consumption) via a crafted string containing a list of
e-mail addresses in conjunction with parenthesis characters that can be
associated with nested comments. NOTE: the default configuration in 1.908
mitigates this vulnerability but misparses certain realistic comments.