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Fencer Intel
medium 6.5

CVE-2019-6286 json

In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::skip_over_scopes in prelexer.hpp when called from Sass::Parser::p…

published 7y ago modified 3mo ago also EUVD-2019-15852 , JLSEC-2026-510

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::skip_over_scopes in prelexer.hpp when called from Sass::Parser::parse_import(), a similar issue to CVE-2018-11693.

Patch / fix

  • julia libsass_jll 3.6.4+0
  • libsass Debian 14, Debian 13, Debian 12 3.5.5-3

debian advisories DEBIAN-CVE-2019-6286

  • libsass Ubuntu Pro 18.04 LTS 3.4.8-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2019-6286

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libsass Package Hub 15 SP1 3.6.1-bp151.4.3.1
  • libsass Package Hub 15 3.6.1-bp150.3.3.1
  • libsass openSUSE Leap 15.1, openSUSE Leap 15.0 3.6.1-lp151.3.3.1

opensuse advisories openSUSE-SU-2019:1883-1openSUSE-SU-2019:1800-1openSUSE-SU-2019:1791-1

Is CVE-2019-6286 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2019-6286 updated cvss 3.3

libsass: heap-based buffer over-read in Sass::Prelexer::skip_over_scopes in prelexer.hpp

  • Red Hat Enterprise Linux 8 libsass
    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

2.12% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/sass/libsass/issues/2815 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
OSV 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia libsass_jll
<3.6.4+0
3.6.4+0

Classification

Weakness

References

Sources

Fencer Intel 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.