Bug 2523418

Summary: CVE-2026-40962 qt5-qtwebengine: FFmpeg: Integer overflow and out-of-bounds write via CENC subsample data [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Sandipan Roy <saroy>
Component: qt5-qtwebengineAssignee: Jan Grulich <jgrulich>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: jgrulich, kde-sig, kevin
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["a2a860f5-d40d-47fa-80bf-e288b6b88419"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2458862    

Description Sandipan Roy 2026-08-25 12:51:12 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 before 8.1 has an integer overflow and resultant out-of-bounds write via CENC (Common Encryption) subsample data to libavformat/mov.c.