Module::Signature before 0.74 allows remote attackers to bypass signature verification for files via a signature file that does not list the files.
https://github.com/audreyt/module-signature/commit/8a9164596fa5952d4fbcde5aa1c7d1c7bc85372f
http://ubuntu.com/usn/usn-2607-1
http://www.debian.org/security/2015/dsa-3261