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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/lepture/mistune/security/advisories/GHSA-8g87-j6q8-g93x
X_Refsource_Misc x_refsource_misc
https://github.com/lepture/mistune/releases/tag/v3.2.1
Scores
CVSS v3
6.1
EPSS
0.0020
EPSS Percentile
9.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (3)
lepture/mistune
< 3.2.1
mistune_project/mistune
< 3.2.1
pypi/mistune
0 - 3.2.0PyPI
Published
May 26, 2026
Tracked Since
May 27, 2026