Read the docs
TI-2019-13536 Aliases CVE-2019-18799GHSA-j6f2-xv6r-9x28

LibSass before 3.6.3 allows a NULL pointer dereference in Sass::Parser::parseCompoundSelector in parser_selectors.cpp.

Priority LOW 31CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-476.

Summary

LibSass before 3.6.3 allows a NULL pointer dereference in Sass::Parser::parseCompoundSelector in parser_selectors.cpp.

Why it matters now

EPSS 0.0125 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:sass-lang:libsass:*:*:*:*:*:*:*:*before 3.6.3VulnerableSass-lang
  • cpe:2.3:a:sass-lang:libsass:*:*:*:*:*:*:*:* Versions before 3.6.3 Vulnerable ·Sass-lang

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-18799
  2. 2026-10-03 Alias added: GHSA-j6f2-xv6r-9x28

References

Exploit 1

  • TI-2022-21169 Stack overflow vulnerability in ast_selectors.cpp: in function… CVSS 3.1HIGH 7.5
  • TI-2022-21168 Stack overflow vulnerability in ast_selectors.cpp in function… CVSS 3.1HIGH 7.5
  • TI-2018-08219 A use-after-free vulnerability exists in handle_error() in sass_context.cpp in LibSass… CVSS 3.0CRITICAL 9.8
  • TI-2022-09890 Stack Overflow vulnerability in libsass 3.6.5 via the CompoundSelector::has_real_parent_ref function. CVSS 3.1HIGH 8.8
  • TI-2018-14042 In LibSass 3.5.5, a use-after-free vulnerability exists in the SharedPtr class in… CVSS 3.0HIGH 8.8
  • TI-2018-08363 An issue was discovered in LibSass through 3.5.4. CVSS 3.0HIGH 8.8
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences