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CVE-2018-19797

22
FAUCET Score

CVE-2018-19797 describes a NULL Pointer Dereference vulnerability in LibSass 3.5.5, specifically within the Sass::Selector_List::populate_extends function, impacting sass-lang libsass. This flaw can lead to a Denial of Service (application crash) when processing a specially crafted sass input file. With a CVSS score of 6.5 (Medium), it requires user interaction (UI:R) and can be triggered remotely (AV:N) with low attack complexity (AC:L), resulting in high availability impact (A:H). There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
3.5.5CPE matchmatch criteria
cpe:2.3:a:sass-lang:libsass:3.5.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/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
3.0

Exploit Intelligence

EPSS Score
1.83%
Probability of exploitation in next 30 days
EPSS Percentile
76.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0183 is in the 88th 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

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 20124-17086Fixed in: 3.1.1-20
microsoftpatch availablevia msrc
Product: cbl2 reaper 3.1.1-19 on CBL Mariner 2.0Fixed in: 3.1.1-20

Vendor Advisories (1)

microsoft2018-Dec/CVE-2018-19797Moderate

In LibSass 3.5.5, a NULL Pointer Dereference in the function Sass::Selector_List::populate_extends in SharedPtr.hpp (used by ast.cpp and ast_selectors.cpp) may cause a Denial of Service (application crash) via a crafted sass input file.

Dec 11, 2018

References

lists.opensuse.org / opensuse-security-announce/2019-07/msg00047.html
lists.opensuse.org / opensuse-security-announce/2019-07/msg00051.html
lists.opensuse.org / opensuse-security-announce/2019-08/msg00027.html
github.com / sass/libsass/issues/2779
PatchThird Party Advisory