CVE-2026-59923

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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Produits concernés

• lepture mistune
• Mistune project mistune

Scores CVSS

Faiblesses (CWE)

• CWE-79

Références

• https://github.com/lepture/mistune/commit/c7101fcbb6e8790e8e39157c5ca2238fc6dd6cbc Patch
• https://github.com/lepture/mistune/releases/tag/v3.3.0 Release Notes
• https://github.com/lepture/mistune/security/advisories/GHSA-8c25-4j27-2rv3 ExploitVendor Advisory
• https://github.com/lepture/mistune/security/advisories/GHSA-8c25-4j27-2rv3 ExploitVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories