Bug 2523100 (CVE-2026-76098) - CVE-2026-76098 mistune: Mistune: Denial of Service via excessive emphasis markers in Markdown
Summary: CVE-2026-76098 mistune: Mistune: Denial of Service via excessive emphasis mar...
Keywords:
Status: NEW
Alias: CVE-2026-76098
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-24 20:21 UTC by OSIDB Bzimport
Modified: 2026-09-01 08:35 UTC (History)
16 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-08-24 20:21:31 UTC
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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