Security Advisory

CVE-2026-59923

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 16:14:39

Last updated 2026-07-08 16:41:52

Assigner GitHub_M

CVSS score 6.1

State PUBLISHED

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.

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