ii bash 4.3-9 i386 GNU Bourne Again SHell
$ env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
vulnerable this is a test
From the FAQ:
> Does sid have security updates?
Not in the same sense that stable does. If the maintainer of a package fixes a security bug and uploads the package, it'll go into sid by the normal means. If the maintainer doesn't do that, then it won't. The security team only covers stable (and possibly testing... there's a pending issue for that case).