Vulnerability 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
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/lepture/mistune/commit/0938fb7
- https://github.com/lepture/mistune/security/advisories/GHSA-6m44-fpc8-c3rq
- https://github.com/lepture/mistune/security/advisories/GHSA-6m44-fpc8-c3rq
FAQ
What is CVE-2026-76098?
CVE-2026-76098 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 fr...
How severe is CVE-2026-76098?
CVE-2026-76098 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-76098?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.