Stack Overflow vulnerability in libsass 3.6.5 via the CompoundSelector::has_real_parent_ref function. 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 . Also affects the command line driver for libsass, sassc 3.6.2. Stack overflow vulnerability in ast_selectors.cpp: in function Sass::ComplexSelector::has_placeholder in libsass:3.6.5-8-g210218, which can be exploited by attackers to cause a denial of service