CVE-2026-76098
High
Description
Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.render_token() can exceed Python's recursion limit and raise RecursionError, allowing crafted Markdown to crash a parsing process. This issue is fixed in version 3.3.3
SeverityHigh
CVSS7.5
Exploit probability—
ProductMistune
PublishedAug 24, 2026
First seenAug 24, 2026
Weakness typeCWE-674CWE-674
How to fix
Update
- mistune3.3.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mistunePyPI | 3.3.0 ≤ v < 3.3.3 | 3.3.3 |
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