CVE-2026-76098

Published: Aug 24, 2026Modified: Sep 9, 2026Deferred

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

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

Related CWEs

CWE-674

Uncontrolled Recursion

The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

References (3)

https://github.com/lepture/mistune/commit/0938fb7

Source: security-advisories@github.com

https://github.com/lepture/mistune/security/advisories/GHSA-6m44-fpc8-c3rq

Source: security-advisories@github.com

https://github.com/lepture/mistune/security/advisories/GHSA-6m44-fpc8-c3rq

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.