Bug 2449585 (CVE-2026-33123)

Summary: CVE-2026-33123 pypdf: pypdf: Denial of Service due to excessive resource consumption from crafted PDF
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, 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
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Hardware: All   
OS: Linux   
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A flaw was found in pypdf, a pure-python PDF library. An attacker can craft a malicious PDF file that, when processed, leads to excessive resource consumption, causing long runtimes and high memory usage. This can result in a Denial of Service (DoS) condition, making the application unresponsive or unstable.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-03-20 11:02:25 UTC
pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.