In LibSass 3.5.5, a NULL Pointer Dereference in the function Sass::SelectorList::populateextends in SharedPtr.hpp (used by ast.cpp and ast_selectors.cpp) may cause a Denial of Service (application crash) via a crafted sass input file.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-19797.json"