CVE-2018-20821: Sass-Lang Libsass

Medium severity, CVSS 6.5. EPSS: 2.2% chance of exploitation in the next 30 days.

The parsing component in LibSass through 3.5.5 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::Parser::parse_css_variable_value in parser.cpp).

Affected products

• Sass-Lang Libsass: up to and including 3.5.5

Published 2019-04-23. Last modified 2026-06-17.