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CVE-2019-10842 — Vulnerability in bootstrap-sass — CVE Details

CRITICAL

Bootstrap-sass contains code execution backdoor

Published April 4, 2019Updated March 13, 2026Source: osv

Summary

Arbitrary code execution (via backdoor code) was discovered in bootstrap-sass 3.2.0.3, when downloaded from rubygems.org. An unauthenticated attacker can craft the ___cfduid cookie value with base64 arbitrary code to be executed via eval(), which can be leveraged to execute arbitrary code on the target system. Note that there are three underscore characters in the cookie name. This is unrelated to the __cfduid cookie that is legitimately used by Cloudflare.

Advisory Timeline

  • First published April 4, 2019 (2748 days ago).
  • Last revised March 13, 2026 — 2535 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update bootstrap-sass to 3.2.0.4 or later
gem install bootstrap-sass -v 3.2.0.4

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
bootstrap-sass
rubygems
3.2.0.33.2.0.4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2019-10842?
Bootstrap-sass contains code execution backdoor This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2019-10842?
CVE-2019-10842 affects bootstrap-sass. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2019-10842 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-vqqv-v9m2-48p2

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