An issue was discovered in LibSass through 3.5.4.

published 2018-06-04 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-3713

cvss: 8.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.7%; EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits: 0; none known

An issue was discovered in LibSass through 3.5.4. A NULL pointer dereference was found in the function Sass::Functions::selector_append which could be leveraged by an attacker to cause a denial of service (application crash) or possibly have unspecified other impact.

Patch / fix

distros 2 links 1

debian azure linux

libsass Debian 14, Debian 13, Debian 12 3.6.3-1

debian advisories DEBIAN-CVE-2018-11694

reaper CBL-Mariner 2.0 3.1.1-6

azure linux advisories AZL-27684

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

github.com/sass/libsass/issues/2663 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-11694 updated 2025-11-21 cvss 4.7

libsass: NULL pointer dereference in function Sass::Functions::selector_append in functions.cpp

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.68% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/sass/libsass/issues/2663 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-476 NULL Pointer Dereference

References

github.com /sass/libsass/issues/2663
exploit, issue-tracking, patch, third-party-advisory

Sources

CVE List CVE-2018-11694
NVD CVE-2018-11694

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary