In LibSass 3.5.5, a use-after-free vulnerability exists in the SharedPtr class in SharedPtr.cpp (or SharedPtr.hpp) that may cause a denial of service (application crash) or possibly have unspecified other impact.

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.

DISPUTED In inspect.cpp in LibSass 3.5.5, a high memory footprint caused by an endless loop (containing a Sass::Inspect::operator()(Sass::StringQuoted) stack frame) may cause a Denial of Service via crafted sass input files with stray '&' or '/' characters. NOTE: Upstream comments indicate this issue is closed as "won't fix" and "works as intended" by design.

LibSass is vulnerable to a denial of service, caused by uncontrolled recursion in Sass::Parser::parsecssvariablevalue in parser.cpp. By persuading a victim to open a specially-crafted file, a remote attacker could exploit this vulnerability to cause the application to crash.

In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::alternatives in prelexer.hpp.

In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::parenthesescope in prelexer.hpp.

In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::skipoverscopes in prelexer.hpp when called from Sass::Parser::parseimport(), a similar issue to CVE-2018-11693.

In LibSass 3.5.5, a NULL Pointer Dereference in the function Sass::Eval::operator()(Sass::SupportsOperator) in eval.cpp may cause a Denial of Service (application crash) via a crafted sass input file.