CVE-2026-44897

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, HTMLRenderer.heading() builds the opening <hN> tag by string-concatenating the id attribute value directly into the HTML — with no call to escape(), safe_entity(), or any other sanitisation function. A double-quote character " in the id value terminates the attribute, allowing an attacker to inject arbitrary additional attributes (event handlers, src=, href=, etc.) into the heading element. This vulnerability is fixed in 3.2.1.

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Produits concernés

• lepture mistune
• Mistune project mistune

Scores CVSS

Faiblesses (CWE)

• CWE-79

Références

• https://github.com/lepture/mistune/releases/tag/v3.2.1 ProductRelease Notes
• https://github.com/lepture/mistune/security/advisories/GHSA-v87v-83h2-53w7 ExploitVendor Advisory

Ailleurs

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