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CVE-2026-44899

6.1 Moyenne

Publiée le 26/05/2026 à 23:16 · Modifiée le 24/07/2026 à 13:10 · Analysée par le NVD · Source : security-advisories@github.com

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the Image directive plugin validates the :width: and :height: options with a regex compiled as _num_re = re.compile(r"^\d+(?:\.\d*)?"). When the validated value is not a plain integer, render_block_image() inserts it directly into a style="width:...;" or style="height:...;" attribute. Because the value was accepted by the prefix-only regex, any CSS after the leading digits reaches the style= attribute verbatim and without escaping. This vulnerability is fixed in 3.2.1.

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Produits concernés

Scores CVSS

VersionScoreSourceVecteur
3.1 4.7 Moyenne security-advisories@github.com CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
3.1 6.1 Moyenne nvd@nist.gov (NVD) CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Faiblesses (CWE)

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