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No exploitation reportedFix available

CVE-2018-19839

No exploitation reported by the sources we read.

  • Published2018-12-04
  • Fixed in3.5.5
  • WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In LibSass prior to 3.5.5, the function handle_error in sass_context.cpp allows attackers to cause a denial-of-service resulting from a heap-based buffer over-read via a crafted sass file.

Timeline

dates in UTC
  1. 2018-12-0409:29CVE publishedNVD

Versions per branch

NVD
Sass-lang libsass
BranchAffectedFixed in
3.5< 3.5.53.5.5

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libsassUbuntu:Pro:18.04:LTSall versions · fixed in 3.4.8-1ubuntu0.1~esm1
  • libsassUbuntu:16.04:LTSall versions · no fixed version listed
  • libsassSUSE:Package Hub 15 SP1all versions · fixed in 3.6.1-bp151.4.3.1
  • libsassSUSE:Package Hub 15all versions · fixed in 3.6.1-bp150.3.3.1
  • libsassopenSUSE:Leap 15.1all versions · fixed in 3.6.1-lp151.3.3.1
  • libsassopenSUSE:Leap 15.0all versions · fixed in 3.6.1-lp151.3.3.1
  • libsassMageia:7all versions · fixed in 3.6.1-1.mga7
  • libsassDebian:14all versions · fixed in 3.5.5-4

2 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-19839 Red Hat Product Security

    libsass: Heap-based buffer over-read in the handle_error function resulting in a denial of service

Full record on NVD

Fix

  1. Update Sass-lang libsass to 3.5.5

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published
2018-12-04
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-pfp7-r6qm-94j7

Frequently asked questions

What is CVE-2018-19839?

In LibSass prior to 3.5.5, the function handle_error in sass_context.cpp allows attackers to cause a denial-of-service resulting from a heap-based buffer over-read via a crafted sass file.

Is CVE-2018-19839 actively exploited?

Active exploitation of CVE-2018-19839 has not been confirmed. Its EPSS score was 2.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-19839?

CVE-2018-19839 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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