Bug 2460896 (CVE-2026-41168)

Summary:	CVE-2026-41168 pypdf: pypdf: Denial of Service via crafted PDF with oversized streams
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anpicker, bbrownin, bdettelb, bparees, doconnor, dschmidt, ebourniv, erezende, hasun, jfula, jkoehler, jlanda, jowilson, jwong, kshier, lgallett, lphiri, nyancey, omaciel, ometelka, ptisnovs, sbunciak, simaishi, smcdonal, stcannon, syedriko, teagle, ttakamiy, xdharmai, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in pypdf. An attacker can craft a malicious PDF file containing oversized cross-reference streams or object streams. Processing such a file can lead to excessively long runtimes, resulting in a Denial of Service (DoS) for applications using the pypdf library.	Story Points:	---
Clone Of:		Environment:
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-04-22 21:02:15 UTC

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size` values or object streams with wrong large `/N` values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.