CVE-2026-44708
MEDIUM6.1EPSS 0.03%Mistune Math Plugin has an XSS Escape Bypass
Published: 5/8/2026Modified: 5/29/2026
Description
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the mistune math plugin renders inline math ($...$) and block math ($$...$$) by concatenating the raw user-supplied content directly into the HTML output without any HTML escaping. This occurs even when the parser is explicitly created with escape=True, which is supposed to guarantee that all user-controlled text is sanitised before reaching the DOM. This vulnerability is fixed in 3.2.1.
Affected packages (2)
- Debian/mistunefrom 0
- PyPI/mistunefrom 0, <= 3.2.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |