UBUNTU-CVE-2021-28834

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Source
https://ubuntu.com/security/CVE-2021-28834
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28834.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-28834
Upstream
Downstream
Related
Published
2021-03-19T07:15:00Z
Modified
2025-07-18T16:46:44Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.

References

Affected packages

Ubuntu:20.04:LTS / ruby-kramdown

Package

Name
ruby-kramdown
Purl
pkg:deb/ubuntu/ruby-kramdown@1.17.0-4ubuntu0.2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.17.0-4ubuntu0.2

Affected versions

1.*

1.17.0-1
1.17.0-2
1.17.0-4
1.17.0-4ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kramdown",
            "binary_version": "1.17.0-4ubuntu0.2"
        },
        {
            "binary_name": "ruby-kramdown",
            "binary_version": "1.17.0-4ubuntu0.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28834.json"