CVE-2019-6284 In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::alternatives in prelexer.hpp.

MediumCVSS 6.5 EPSS 2.0%

Published: 2019-01-15 00:00
Updated: 2026-09-21 10:02
Exploit status: No public exploit known

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Description

In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::alternatives in prelexer.hpp.

Affected products

Product	Affected versions	Fixed in
debian/libsass(Debian:12)	< 3.5.5-3	3.5.5-3
debian/libsass(Debian:13)	< 3.5.5-3	3.5.5-3
debian/libsass(Debian:14)	< 3.5.5-3	3.5.5-3
sass-lang libsass	= 3.5.5	No fix listed

References

Debian Security Tracker CVE-2019-6284 vendor-advisory
openSUSE-SU-2019:1791 broken-link vendor-advisory
openSUSE-SU-2019:1800 broken-link vendor-advisory
openSUSE-SU-2019:1883 broken-link vendor-advisory
github.com exploit third-party-advisory

CVSS v3.1

6.5 Medium

CVSS:3.1/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: None
Integrity: None
Availability: High

All scores (3)

v3.1 6.5 · nvd@nist.gov
v3.1 6.5 · osv:debian
v2.0 4.3 · nvd@nist.gov

Weakness & likelihood

EPSS (exploitation probability, 30 days): 2.01% (percentile 81.2)
CWE: CWE-125

Public exploit references

Metadata only. CVERadar never hosts or runs exploit code.

No public exploit references known.