Mojolicious before 0.999927 does not properly implement HMAC-MD5 checksums, which has unspecified impact and remote attack vectors.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2010-4768
http://www.debian.org/security/2011/dsa-2239
http://cpansearch.perl.org/src/KRAIH/Mojolicious-1.20/Changes