What’s Vulnerable › Vulnerabilities

CVE-2019-18799

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-11-06 · updated 2026-06-17
• Weakness: CWE-476

Description

LibSass before 3.6.3 allows a NULL pointer dereference in Sass::Parser::parseCompoundSelector in parser_selectors.cpp.

Affected products

• Sass-Lang Libsass: before 3.6.3 — fixed in 3.6.3

How to fix

Upgrade to a fixed version: Sass-Lang Libsass 3.6.3. Check the vendor advisory for mitigations.

References

• https://github.com/sass/libsass/issues/3001
• https://github.com/sass/libsass/issues/3001

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