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CVE-2019-6284

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

6.5 MediumFix available

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

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.01%Up 1.0 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

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

Record
CVE-2019-6284
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness
CWE-125
Updated
2026-11-02
CVE List No score

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

Record
CVE-2019-6284
Updated
2026-11-02
EUVDEUVD-2019-15850 No score

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

Record
EUVD-2019-15850
Updated
2026-11-03
GitHub AdvisoriesGHSA-xj4c-cq8p-ghhc 6.5

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

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

Record
GHSA-xj4c-cq8p-ghhc
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSV 6.5

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

Record
CVE-2019-6284
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2019-6284 6.5

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

Record
DEBIAN-CVE-2019-6284
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 8 moreShow less
OSVJLSEC-2026-509 6.5

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

Record
JLSEC-2026-509
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Updated
2026-11-02
OSVUBUNTU-CVE-2019-6284 6.5

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

Record
UBUNTU-CVE-2019-6284
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2020-0049 No score

Updated libsass packages fix security vulnerabilities

Use-after-free vulnerability in sass_context.cpp:handle_error (CVE-2018-11499).

Null pointer dereference in Sass::Selector_List::populate_extends (CVE-2018-19797).

Use-after-free vulnerability exists in the SharedPtr class (CVE-2018-19827).

Stack overflow in Eval::operator() (CVE-2018-19837).

Stack-overflow at IMPLEMENT_AST_OPERATORS expansion (CVE-2018-19838).

Buffer-overflow (OOB read) against some invalid input (CVE-2018-19839).

Null pointer dereference in Sass::Eval::operator() (Sass::Supports_Operator*) (CVE-2018-20190).

Uncontrolled recursion in Sass:Parser:parse_css_variable_value (CVE-2018-20821).

Stack-overflow at Sass::Inspect::operator() (CVE-2018-20822).

Heap-buffer-overflow in Sass::Prelexer::parenthese_scope(char const*) (CVE-2019-6283).

Heap-based buffer over-read exists in Sass:Prelexer:alternatives (CVE-2019-6284).

Heap-based buffer over-read exists in Sass:Prelexer:skip_over_scopes (CVE-2019-6286).

Record
MGASA-2020-0049
Updated
2026-11-02
OSVopenSUSE-SU-2019:1791-1 No score

Security update for libsass

This update for libsass to version 3.6.1 fixes the following issues:

Security issues fixed:

  • CVE-2019-6283: Fixed heap-buffer-overflow in Sass::Prelexer::parenthese_scope(char const*) (boo#1121943).
  • CVE-2019-6284: Fixed heap-based buffer over-read exists in Sass:Prelexer:alternatives (boo#1121944).
  • CVE-2019-6286: Fixed heap-based buffer over-read exists in Sass:Prelexer:skip_over_scopes (boo#1121945).
  • CVE-2018-11499: Fixed use-after-free vulnerability in sass_context.cpp:handle_error (boo#1096894).
  • CVE-2018-19797: Disallowed parent selector in selector_fns arguments (boo#1118301).
  • CVE-2018-19827: Fixed use-after-free vulnerability exists in the SharedPtr class (boo#1118346).
  • CVE-2018-19837: Fixed stack overflow in Eval::operator() (boo#1118348).
  • CVE-2018-19838: Fixed stack-overflow at IMPLEMENT_AST_OPERATORS expansion (boo#1118349).
  • CVE-2018-19839: Fixed buffer-overflow (OOB read) against some invalid input (boo#1118351).
  • CVE-2018-20190: Fixed Null pointer dereference in Sass::Eval::operator()(Sass::Supports_Operator*) (boo#1119789).
  • CVE-2018-20821: Fixed uncontrolled recursion in Sass:Parser:parse_css_variable_value (boo#1133200).
  • CVE-2018-20822: Fixed stack-overflow at Sass::Inspect::operator() (boo#1133201).
Record
openSUSE-SU-2019:1791-1
Updated
2026-11-02
OSVopenSUSE-SU-2019:1800-1 No score

Security update for libsass

This update for libsass to version 3.6.1 fixes the following issues:

Security issues fixed:

  • CVE-2019-6283: Fixed heap-buffer-overflow in Sass::Prelexer::parenthese_scope(char const*) (boo#1121943).
  • CVE-2019-6284: Fixed heap-based buffer over-read exists in Sass:Prelexer:alternatives (boo#1121944).
  • CVE-2019-6286: Fixed heap-based buffer over-read exists in Sass:Prelexer:skip_over_scopes (boo#1121945).
  • CVE-2018-11499: Fixed use-after-free vulnerability in sass_context.cpp:handle_error (boo#1096894).
  • CVE-2018-19797: Disallowed parent selector in selector_fns arguments (boo#1118301).
  • CVE-2018-19827: Fixed use-after-free vulnerability exists in the SharedPtr class (boo#1118346).
  • CVE-2018-19837: Fixed stack overflow in Eval::operator() (boo#1118348).
  • CVE-2018-19838: Fixed stack-overflow at IMPLEMENT_AST_OPERATORS expansion (boo#1118349).
  • CVE-2018-19839: Fixed buffer-overflow (OOB read) against some invalid input (boo#1118351).
  • CVE-2018-20190: Fixed Null pointer dereference in Sass::Eval::operator()(Sass::Supports_Operator*) (boo#1119789).
  • CVE-2018-20821: Fixed uncontrolled recursion in Sass:Parser:parse_css_variable_value (boo#1133200).
  • CVE-2018-20822: Fixed stack-overflow at Sass::Inspect::operator() (boo#1133201).

This update was imported from the openSUSE:Leap:15.0:Update update project.

Record
openSUSE-SU-2019:1800-1
Updated
2026-11-02
OSVopenSUSE-SU-2019:1883-1 No score

Security update for libsass

This update for libsass to version 3.6.1 fixes the following issues:

Security issues fixed:

  • CVE-2019-6283: Fixed heap-buffer-overflow in Sass::Prelexer::parenthese_scope(char const*) (boo#1121943).
  • CVE-2019-6284: Fixed heap-based buffer over-read exists in Sass:Prelexer:alternatives (boo#1121944).
  • CVE-2019-6286: Fixed heap-based buffer over-read exists in Sass:Prelexer:skip_over_scopes (boo#1121945).
  • CVE-2018-11499: Fixed use-after-free vulnerability in sass_context.cpp:handle_error (boo#1096894).
  • CVE-2018-19797: Disallowed parent selector in selector_fns arguments (boo#1118301).
  • CVE-2018-19827: Fixed use-after-free vulnerability exists in the SharedPtr class (boo#1118346).
  • CVE-2018-19837: Fixed stack overflow in Eval::operator() (boo#1118348).
  • CVE-2018-19838: Fixed stack-overflow at IMPLEMENT_AST_OPERATORS expansion (boo#1118349).
  • CVE-2018-19839: Fixed buffer-overflow (OOB read) against some invalid input (boo#1118351).
  • CVE-2018-20190: Fixed Null pointer dereference in Sass::Eval::operator()(Sass::Supports_Operator*) (boo#1119789).
  • CVE-2018-20821: Fixed uncontrolled recursion in Sass:Parser:parse_css_variable_value (boo#1133200).
  • CVE-2018-20822: Fixed stack-overflow at Sass::Inspect::operator() (boo#1133201).

This update was imported from the openSUSE:Leap:15.0:Update update project.

Record
openSUSE-SU-2019:1883-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10988-1 No score

libsass-3_6_5-1-3.6.5-1.2 on GA media

These are all security issues fixed in the libsass-3_6_5-1-3.6.5-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10988-1
Updated
2026-11-02
OSVUSN-4837-1 No score

libsass vulnerabilities

It was discovered that LibSass incorrectly handled certain specially crafted sass file. An attacker could possibly use this issue to cause a denial of service or other unspecified impact.

Record
USN-4837-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libsass
Debian:12
 before 3.5.5-3
3.5.5-3
libsass
Debian:13
 before 3.5.5-3
3.5.5-3
libsass
Debian:14
 before 3.5.5-3
3.5.5-3
libsass_jll
Julia
 before 3.6.4+0
3.6.4+0
libsass
Mageia:7
 before 3.6.1-1.mga7
3.6.1-1.mga7
libsass
Ubuntu:16.04:LTS
 All versions, plus listed versions
3.2.5-13.2.5-23.3.2-13.3.4-1
 None known
libsass
Ubuntu:Pro:18.04:LTS
 before 3.4.8-1ubuntu0.1~esm1, plus listed versions
3.4.3-13.4.6-13.4.8-1
3.4.8-1ubuntu0.1~esm1
libsass
openSUSE:Leap 15.0
 before 3.6.1-lp151.3.3.1
3.6.1-lp151.3.3.1
libsass
openSUSE:Leap 15.1
 before 3.6.1-lp151.3.3.1
3.6.1-lp151.3.3.1
libsass
SUSE:Package Hub 15
 before 3.6.1-bp150.3.3.1
3.6.1-bp150.3.3.1
libsass
SUSE:Package Hub 15 SP1
 before 3.6.1-bp151.4.3.1
3.6.1-bp151.4.3.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-6284 is a medium vulnerability (CVSS 6.5) in Sass-lang Libsass, published January 14, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.01%, the 80th percentile. Fixed in libsass 3.5.5-3.

References

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