Bug 2569541 (CVE-2026-125244)

Summary: CVE-2026-125244 ffmpeg: VVC decoder out-of-bounds write via sh_entry_points()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: bbrownin
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in FFmpeg. An out-of-bounds write can occur in the VVC (Versatile Video Coding / H.266) decoder when handling a specially crafted bitstream due to improper bounds checking in sh_entry_points(). This vulnerability can allow an attacker to corrupt decoder memory, potentially leading to an application crash, denial of service or arbitrary code execution.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2571268, 2571269    
Bug Blocks:    

Description OSIDB Bzimport 2026-11-10 13:01:40 UTC
FFmpeg before 8.1.3 and 9.x before 9.0.2 contains an out-of-bounds write vulnerability in the VVC decoder's sh_entry_points() function in libavcodec/vvc/ps.c. Attackers can supply a crafted VVC (H.266) bitstream whose SPS/PPS tile and WPP layout produces excess entry points, overflowing entry_point_start_ctu and corrupting decoder memory.