Bug 2563181

Summary: CVE-2026-112403 python-pillow: Pillow: Heap buffer overflow in ImagingJpegDecode [fedora-all]
Product: [Fedora] Fedora Reporter: aedmond
Component: python-pillowAssignee: Sandro Mani <manisandro>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: urgent Docs Contact:
Priority: urgent    
Version: rawhideCC: epel-packagers-sig, infra-sig, manisandro, python-packagers-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["d007e03b-a62f-4f36-9590-37505a21a5eb"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2555871    

Description aedmond 2026-10-28 20:28:08 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's JPEG decoder can write a full-width scanline into a buffer sized for a requested draft scale. ImagingJpegDecode does not verify libjpeg's actual output width and component count after scaling is requested, and an 8-bit lossless SOF3 JPEG decoded by a build linked to libjpeg-turbo 3.x can ignore the requested downscaling geometry. An attacker can supply such a JPEG to an application that uses draft() or thumbnail() to request downscaling. This can corrupt heap memory, crash the process, or potentially allow code execution. Older libjpeg-turbo 2.x and IJG builds reject the SOF3 input. This issue is fixed in version 13.0.0.
Comment 1 Fedora Update System 2026-10-31 12:13:12 UTC 
FEDORA-2026-bae971fad8 (python-pillow-11.3.0-14.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-bae971fad8
Comment 2 Fedora Update System 2026-11-01 03:17:24 UTC 
FEDORA-2026-bae971fad8 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-bae971fad8`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-bae971fad8

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.