red SECURITY on package pages?

["Tom Cerul" <tom.cerul@verizon.net>]

on http://packages.debian.org/stable/base/locales for 
example, What does the large red [security] label 
mean?
Is this package a security risk? Does this update fix a 
security hole?  Is this package one of the select few 
which are very secure?

Thanks for your time,
Tom