Bug 2528042

Summary: CVE-2026-84310 python-pypdf: pypdf: Denial of Service via crafted PDF outlines [fedora-all]
Product: [Fedora] Fedora Reporter: Joel Chamberlain <jochambe>
Component: python-pypdfAssignee: Davide Cavalca <davide>
Status: CLOSED RAWHIDE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: davide, tadej.j
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["e28f04d9-af3f-4f18-8a8b-08cae285cbe8"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
Last Closed: 2026-09-11 10:10:58 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2527049    

Description Joel Chamberlain 2026-09-03 14:21:28 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.

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.
Comment 1 Tadej Janež 2026-09-11 10:10:58 UTC 
Version 6.16.2 is in rawhide.

For Fedora 44/43, I'm reluctant to upgrade them since it would be upgrading 2 major versions (from 4.2.0 to 6.16.2) in a stable release.