Stack overflow vulnerability in ast_selectors.cpp in function Sass::CompoundSelector::has_real_parent_ref in libsass:3.6.5-8-g210218, which can be exploited by attackers to causea denial of service (DoS). Also affects the command line driver for libsass, sassc 3.6.2.
https://github.com/sass/libsass/issues/3177
https://github.com/sass/libsass
https://drive.google.com/file/d/1aC5q3czen0atI91fuBIoCBFkS30_OSWX/