CVE-2020-14001: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 4.6% chance of exploitation in the next 30 days.

The kramdown gem before 2.3.0 for Ruby processes the template option inside Kramdown documents by default, which allows unintended read access (such as template="/etc/passwd") or unintended embedded Ruby code execution (such as a string that begins with template="string://<%= `). NOTE: kramdown is used in Jekyll, GitLab Pages, GitHub Pages, and Thredded Forum.

Affected products

• Canonical Ubuntu Linux: version 20.04 only
• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 31 only; version 32 only
• Kramdown Project Kramdown: before 2.3.0 (fixed in 2.3.0)

Published 2020-07-17. Last modified 2026-06-17.