Bug 2507887

Summary: CVE-2026-59925 python-mistune08: Mistune: Denial of Service via crafted Markdown input [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Hardik Vyas <hvyas>
Component: python-mistune08Assignee: Orphan Owner <extras-orphan>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel9CC: epel-packagers-sig, michel, neil, python-packagers-sig
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["3882ea16-054e-46b3-a7d6-a8b41b88eea0"]}
Fixed In Version: Doc Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2487042, 2498153    

Description Hardik Vyas 2026-07-28 06:57:52 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, long sequences of well-formed double-asterisk or triple-asterisk emphasis pairs around a character cause quadratic work in src/mistune/inline_parser.py because the parser scans forward for matching close markers from every potential opening run, allowing denial of service in default Mistune parsing. This issue is fixed in version 3.3.0.
Comment 1 Michel Lind 2026-08-04 17:30:56 UTC 
Reassigning from `epel10` to `epel9`: Bug filed against a branch the package never shipped on.
Comment 2 Fedora Admin user for bugzilla script actions 2026-09-05 02:31:52 UTC 
This package has changed maintainer in Fedora. Reassigning to the new maintainer of this component.