Bug 2494554

Summary: CVE-2026-58049 ffmpeg: FFmpeg: Memory corruption via crafted RASC video stream [fedora-43]
Product: [Fedora] Fedora Reporter: Jon Moroney <jmoroney>
Component: ffmpegAssignee: Multimedia SIG <multimedia-sig>
Status: ASSIGNED --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: 43CC: asn, development.group, dominik, multimedia-sig, ngompa13
Target Milestone: ---Keywords: Reopened, Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["432a34a0-c649-4165-bbe3-27d2af151ac5"]}
Fixed In Version: ffmpeg-9.0.1-1.fc46,ffmpeg-9.0.1-4.fc45,ffmpeg-8.1.3-1.fc44 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-07 06:00:59 UTC 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:    
Bug Blocks: 2493952    

Description Jon Moroney 2026-06-29 17:41:33 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's RASC video decoder (decode_dlta in libavcodec/rasc.c) performs 32-bit reads and writes at the row cursor before the NEXT_LINE row-boundary check and validates the DLTA region in pixel rather than byte units, so a DLTA run on a PAL8 frame can access several bytes past the row allocation. A crafted media stream using the RASC FourCC, decoded by libavcodec, triggers a bitstream-controlled out-of-bounds heap write and adjacent out-of-bounds read, leading to memory corruption.
Comment 1 Aoife Moloney 2026-08-17 15:05:46 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.
Comment 2 Dominik 'Rathann' Mierzejewski 2026-09-29 07:23:25 UTC 
Fixed in:
9.0:   https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/f8d7795dcca36a4dd412e89cbd83e3dfec1e0d81
8.1.3: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/cf148db1a82c8a4dc3ef13407962f901956c10b8

NOT fixed in 7.1.x
Comment 3 Fedora Update System 2026-09-29 07:23:55 UTC 
FEDORA-2026-3e109a0c85 (ffmpeg-8.1.3-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3e109a0c85
Comment 4 Fedora Update System 2026-10-01 01:11:49 UTC 
FEDORA-2026-3e109a0c85 (ffmpeg-8.1.3-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.