A use-after-free vulnerability exists in handleerror() in sasscontext.cpp in LibSass 3.4.x and 3.5.x through 3.5.4 that could be leveraged to cause a denial of service (application crash) or possibly unspecified other impact.

An issue was discovered in LibSass through 3.5.4. A NULL pointer dereference was found in the function Sass::Functions::selectorappend which could be leveraged by an attacker to cause a denial of service (application crash) or possibly have unspecified other impact.

An issue was discovered in LibSass through 3.5.4. A NULL pointer dereference was found in the function Sass::Inspect::operator which could be leveraged by an attacker to cause a denial of service (application crash) or possibly have unspecified other impact.

An issue was discovered in LibSass through 3.5.4. An out-of-bounds read of a memory region was found in the function Sass::handleerror which could be leveraged by an attacker to disclose information or manipulated to read from unmapped memory causing a denial of service.

An issue was discovered in LibSass through 3.5.4. An out-of-bounds read of a memory region was found in the function Sass::Prelexer::skipoverscopes which could be leveraged by an attacker to disclose information or manipulated to read from unmapped memory causing a denial of service.

An issue was discovered in LibSass through 3.5.4. An out-of-bounds read of a memory region was found in the function Sass::Prelexer::exactly() which could be leveraged by an attacker to disclose information or manipulated to read from unmapped memory causing a denial of service.

LibSass 3.5.4 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::ComplexSelector::perform in ast.hpp and Sass::Inspect::operator in inspect.cpp).