Bug 2527049 (CVE-2026-84310)

Summary: CVE-2026-84310 pypdf: pypdf: Denial of Service via crafted PDF outlines
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: anpicker, aruklets, bbrownin, bparees, doconnor, dschmidt, ebourniv, hasun, jfula, jlanda, jowilson, kshier, nyancey, ometelka, ptisnovs, sbunciak, simaishi, stcannon, syedriko, teagle, xdharmai, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in pypdf. A remote attacker could craft a malicious PDF document with specially designed outlines. Processing this document would cause the pypdf library to consume excessive processing time and memory, leading to a Denial of Service (DoS) condition. This vulnerability is due to a lack of limits on entry-count and nesting-depth during outline traversal.
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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: 2528041, 2528042    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-01 20:21:19 UTC
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.