AZL-70994 CVE-2018-19797 affecting package reaper for versions less than 3.1.1-21

In LibSass 3.5.5, a NULL Pointer Dereference in the function Sass::SelectorList::populateextends in SharedPtr.hpp used by ast.cpp and astselectors.cpp may cause a Denial of Service application crash via a crafted sass input file...