Bug 2563685 (CVE-2026-119207)

Summary: CVE-2026-119207 pypdf: pypdf: Denial of Service via crafted invalid PDF dictionary
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, blitton, doconnor, dschmidt, ebourniv, hasun, jfula, jlanda, jowilson, kshier, mbarnett, nyancey, ometelka, ptisnovs, rbobbitt, sbunciak, simaishi, stcannon, syedriko, xdharmai, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in pypdf. It can lead to a Denial of Service (DoS) through excessive memory consumption when processing a crafted, invalid PDF dictionary in strict mode. In this scenario, nested parsing errors repeatedly append text to new exceptions, amplifying the error message size. A remote attacker could supply a malformed PDF document to exhaust available system memory, causing the application to crash or become unresponsive.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-29 21:04:30 UTC
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory when strict mode loads a crafted invalid PDF dictionary. Nested parsing failures add repeated exception text to newly raised errors, allowing a small malformed dictionary to amplify into very large error messages. This issue is fixed in version 6.21.3.