CVE-2022-34749: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking.

Affected products

• Fedoraproject Fedora: version 37 only
• Mistune Project Mistune: up to and including 2.0.2

Published 2022-07-25. Last modified 2026-06-17.