Bug 2558315 (CVE-2026-113786)

Summary: CVE-2026-113786 pypdf: pypdf: Denial of Service via unintended image parser invocation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: anpicker, bbrownin, blitton, doconnor, dschmidt, ebourniv, hasun, ikhan, 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. A remote attacker could trigger a Denial of Service (DoS) or unexpected behavior by enticing a user or service to process a specially crafted PDF document. When an image marked with a JPEG filter is loaded, pypdf fails to restrict decoding to the JPEG format before passing the data to the Pillow image library. Consequently, an unintended image parser is invoked to process the malformed data, potentially leading to application errors or instability.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-21 15:13:03 UTC
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.1, an attacker can craft a PDF containing image data labeled with the /DCTDecode filter that causes Pillow to select and invoke an unintended image parser when the image is loaded. Environments without the optional Pillow dependency are not affected. This issue is fixed in version 6.21.1.