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CVE-2018-19827

27
FAUCET Score

CVE-2018-19827 is a high-severity use-after-free vulnerability in the SharedPtr class of LibSass 3.5.5, impacting sass-lang libsass. This flaw can lead to a denial of service through an application crash and potentially other unspecified impacts. With a CVSS score of 8.8, it is easily exploitable over a network with user interaction, posing a high risk to confidentiality, integrity, and availability. Despite its severity, there is no known active exploitation, publicly available exploit code, 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

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.04%
Probability of exploitation in next 30 days
EPSS Percentile
79.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0204 is in the 78th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

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 (2)

microsoft2018-Dec/CVE-2018-19827Important

In LibSass 3.5.5, a use-after-free vulnerability exists in the SharedPtr class in SharedPtr.cpp (or SharedPtr.hpp) that may cause a denial of service (application crash) or possibly have unspecified other impact.

Dec 11, 2018
redhatCVE-2018-19827Important

libsass: Use-after-free in SharedPtr class resulting in a denial of service

Dec 3, 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/2782
Third Party Advisory