CVE-2018-19837: Sass-Lang Libsass

Medium severity, CVSS 6.5. EPSS: 1.8% chance of exploitation in the next 30 days.

In LibSass prior to 3.5.5, Sass::Eval::operator()(Sass::Binary_Expression*) inside eval.cpp allows attackers to cause a denial-of-service resulting from stack consumption via a crafted sass file, because of certain incorrect parsing of '%' as a modulo operator in parser.cpp.

Affected products

• Sass-Lang Libsass: before 3.5.5 (fixed in 3.5.5)

Published 2018-12-04. Last modified 2026-06-17.