I'm the maintainer for package slirp. There is a security bug, already made public:
I uploaded on Friday a fix for unstable, and I've prepared security upload for Jessie, Buster and Stretch, you can find attached the Jessie debdiff.
I built it with pbuilder, you can find all the files here:
Please tell me if everything is ok, then if you do the upload or I have to do anything else.
This is my first time doing this, sorry if I'm missing something.