CVE-2026-59924: Mistune Project Mistune

Medium severity, CVSS 5.9. EPSS: 0.5% chance of exploitation in the next 30 days.

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.

Affected products

• Mistune Project Mistune: before 3.3.0 (fixed in 3.3.0)

Published 2026-07-08. Last modified 2026-07-09.