Bug 2562702

Summary: CVE-2026-115353 python-mistune: Mistune before 3.3.0 Path Traversal via include Directive [fedora-43]
Product: [Fedora] Fedora Reporter: Samuele Negrini <snegrini>
Component: python-mistuneAssignee: Miro Hrončok <mhroncok>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 43CC: epel-packagers-sig, mhroncok, neil, python-packagers-sig, romain.geissler
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["ae375ef1-20c6-4c6d-9672-23b3a89036e2"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2559281    

Description Samuele Negrini 2026-10-28 10:52:58 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 before 3.3.0 contains a path traversal vulnerability in the RST include directive that allows attackers to read arbitrary files by supplying relative or absolute paths. Attackers can submit markdown containing include directives referencing ../ sequences or absolute paths to embed sensitive files like credentials or environment data in rendered HTML.
Comment 1 Fedora Update System 2026-10-28 12:00:31 UTC 
FEDORA-2026-340793a2f1 (python-mistune-3.3.4-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-340793a2f1
Comment 2 Fedora Update System 2026-10-29 02:21:35 UTC 
FEDORA-2026-340793a2f1 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-340793a2f1`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-340793a2f1

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.