CVE-2018-20821

libsass: parsing component allows attackers to cause denial-of-service

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Severity

Moderate

Red Hat Product Security

7.5

CVSS 3.0

Review impact separately from score.

Published · June 2, 2018

Updated · November 22, 2025

Description

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).

Statement

This issue did not affect the versions of libsass as shipped with Red Hat Enterprise Linux 8 as the flaw was introduced in a newer version of the library.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-674 · Uncontrolled Recursion