High severity7.5NVD Advisory· Published Aug 24, 2026· Updated Sep 9, 2026
CVE-2026-76098
CVE-2026-76098
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
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
mistunePyPI | >= 3.3.0, < 3.3.3 | 3.3.3 |
Affected products
1Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-6m44-fpc8-c3rqghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-76098ghsaADVISORY
- github.com/lepture/mistune/commit/0938fb781d0aded99de801b340ec1f8debeae5b2ghsaWEB
- github.com/lepture/mistune/releases/tag/v3.3.3ghsaWEB
- github.com/lepture/mistune/security/advisories/GHSA-6m44-fpc8-c3rqnvdWEB
- github.com/lepture/mistune/commit/0938fb7nvd
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