CVE-2026-44896
Medium
Description
Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and earlier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer. Version 3.2.1 contains a patch.
SeverityMedium
CVSS6.1
Exploit probability—
ProductMistune
PublishedMay 26, 2026
First seenMay 26, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- mistune3.2.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mistune_project mistune | v ≤ 3.2.0 | — |
| mistunePyPI | v < 3.2.1 | 3.2.1 |
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