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CVE-2019-18799

20
FAUCET Score

CVE-2019-18799 is a NULL pointer dereference vulnerability in LibSass before version 3.6.3, specifically within the Sass::Parser::parseCompoundSelector function, affecting the sass_lang libsass product. Rated as a medium severity vulnerability with a CVSS score of 6.5, it can be triggered remotely with low attack complexity, requiring user interaction, and could lead to high availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage regarding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.6.3CPE matchmatch criteria
cpe:2.3:a:sass-lang:libsass:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.25%
Probability of exploitation in next 30 days
EPSS Percentile
66.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0125 is in the 79th percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2019-18799Moderate

libsass: NULL pointer dereference in Sass:Parser:parseCompoundSelector in parser_selectors.cpp

Oct 7, 2019

References

github.com / sass/libsass/issues/3001
ExploitThird Party Advisory