CVE-2018-19838: Sass-Lang Libsass

Medium severity, CVSS 6.5. EPSS: 1.9% chance of exploitation in the next 30 days.

In LibSass prior to 3.5.5, functions inside ast.cpp for IMPLEMENT_AST_OPERATORS expansion allow attackers to cause a denial-of-service resulting from stack consumption via a crafted sass file, as demonstrated by recursive calls involving clone(), cloneChildren(), and copy().

Affected products

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

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