CVE-2026-59923
MEDIUM
NVD
CVSS Score
6.1
Severity
MEDIUM
Published
Jul 08, 2026
Vendor
unknown
Description
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, HTMLRenderer.safe_url() does not block percent-encoded javascript URIs, allowing attacker-supplied Markdown links or images to bypass URL protections and execute script in rendered HTML. This issue is fixed in version 3.3.0.