Bug 2560086

Summary: CVE-2026-115355 python-mistune: mistune: Arbitrary file read via path traversal in Include directive [fedora-44]
Product: [Fedora] Fedora Reporter: Ronit Dey <rdey>
Component: python-mistuneAssignee: Miro Hrončok <mhroncok>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 44CC: epel-packagers-sig, mhroncok, neil, python-packagers-sig, romain.geissler
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["1a7afefb-684d-4f69-bc64-4b1186ddbf4e"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2559366    

Description Ronit Dey 2026-10-23 17:31:48 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 Include directive that allows attackers to read arbitrary files by supplying ../ sequences in include paths. Attackers can also inject HTML through unescaped error messages and included file contents to perform cross-site scripting even when escape=True is set.
Comment 1 Fedora Update System 2026-10-28 12:02:01 UTC 
FEDORA-2026-ea39a303cf (python-mistune-3.3.4-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ea39a303cf
Comment 2 Fedora Update System 2026-10-29 02:47:18 UTC 
FEDORA-2026-ea39a303cf has been pushed to the Fedora 44 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-ea39a303cf`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-ea39a303cf

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