Bug 2443450 (CVE-2026-28351)

Summary: CVE-2026-28351 pypdf: pypdf: Denial of Service via crafted PDF with RunLengthDecode filter
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: alinfoot, anpicker, bbrownin, bdettelb, bparees, doconnor, dtrifiro, hasun, jfula, jkoehler, jowilson, jwong, lphiri, nyancey, omaciel, ometelka, ptisnovs, rbryant, syedriko, teagle, ttakamiy, weaton, xdharmai
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in pypdf, a free and open-source pure-python PDF library. An attacker can exploit this vulnerability by crafting a malicious PDF file that, when parsed, leads to excessive memory consumption. This occurs specifically when processing the content stream using the RunLengthDecode filter. Successful exploitation can result in a Denial of Service (DoS) condition due to large memory usage.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-02-27 22:01:59 UTC
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.