Bug 2565060

Summary: CVE-2026-120247 qt6-qtwebengine: ffmpeg: Information disclosure via uninitialized heap memory in Huffyuv decoder [epel-10]
Product: [Fedora] Fedora EPEL Reporter: Marian Rehak <mrehak>
Component: qt6-qtwebengineAssignee: Troy Dawson <tdawson>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: jgrulich, kde-sig, tdawson
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["8f7d670b-88f0-48c2-aee2-eccaa2671ab3"]}
Fixed In Version: Doc Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2564497    

Description Marian Rehak 2026-11-02 10:33:49 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.

FFmpeg 2.3 through 9.0.2 contains a use of uninitialized resource vulnerability in the Huffyuv decoder that allows attackers to leak heap memory into decoded pixels via short packed-BGR bitstreams. Attackers can craft a Huffyuv BGR24/BGRA video whose entropy data ends early, causing decode_slice() to add uninitialized s->temp[0] bytes into output frames, exposing heap contents.