What is CVE-2018-19218?

CVE-2018-19218 is a medium-severity vulnerability in Sass-Lang Libsass, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2018-11-12.

How severe is CVE-2018-19218?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in Sass-Lang Libsass

CVE-2018-19218

In LibSass 3.5-stable, there is an illegal address access at Sass::Parser::parse_css_variable_value_token that will lead to a DoS attack.

Vulnerability class: Buffer Overflow

Published 2018-11-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (65.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Sass-Lang Libsass — versions 3.5.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

bugzilla.redhat.com/show_bug.cgi (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-19218?: CVE-2018-19218 is a medium-severity vulnerability in Sass-Lang Libsass, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2018-11-12.
How severe is CVE-2018-19218?: Medium severity. CVSS v3 base score is 6.5 out of 10.