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CVE-2018-19837

22
FAUCET Score

CVE-2018-19837 describes a denial-of-service vulnerability in LibSass versions prior to 3.5.5, affecting the sass-lang libsass product. This flaw, rated Medium severity with a CVSS score of 6.5, allows remote attackers to cause stack consumption and crash the application by providing a specially crafted Sass file that incorrectly parses the '%' character as a modulo operator. While the attack complexity is low, user interaction is required. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.5.5CPE matchmatch criteria
cpe:2.3:a:sass-lang:libsass:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/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 Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.78%
Probability of exploitation in next 30 days
EPSS Percentile
76.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0178 is in the 88th percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

lists.opensuse.org / opensuse-security-announce/2019-07/msg00047.html
lists.opensuse.org / opensuse-security-announce/2019-07/msg00051.html
lists.opensuse.org / opensuse-security-announce/2019-08/msg00027.html
github.com / sass/libsass/commit/210fdff7a65370c2ae24e022a2b35da8c423cc5f
ExploitThird Party Advisory
github.com / sass/libsass/issues/2659
PatchVendor Advisory