Bug 2519501

Summary: CVE-2026-64830 ffmpeg: FFmpeg: Arbitrary code execution via heap buffer overflow in VobSub subtitle demuxer. [fedora-43]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
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: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["e28b7ff8-adfc-4b04-9aa6-8d2f4685880e"]}
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: 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: 2506193    

Description Ganesh 2026-08-19 12:12:27 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 versions 2.1 through 8.1.2 contains a heap buffer overflow vulnerability in the VobSub subtitle demuxer that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct stream IDs than the fixed-size array bounds in libavformat/mpeg.c. Attackers can craft a subtitle file with excessive distinct stream IDs to trigger unbounded writes beyond the vobsub->q[] array boundary via ff_subtitles_queue_insert(), potentially achieving arbitrary code execution in any application using FFmpeg's VobSub demuxer.
Comment 1 Dominik 'Rathann' Mierzejewski 2026-08-25 10:53:46 UTC 
*** Bug 2519511 has been marked as a duplicate of this bug. ***
Comment 2 Dominik 'Rathann' Mierzejewski 2026-09-28 16:27:56 UTC 
Fixed in:
9.0:   https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/dcf8ce2802bf2be1b0c6b8d4996abca7b669978d
8.1.3: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/4fe710047d633ddd7a126352ce0f5f505a0fe843

NOT fixed in 7.1.x.
Comment 3 Fedora Update System 2026-09-28 16:28:30 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 2026-09-29 02:11:09 UTC 
FEDORA-2026-3e109a0c85 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-3e109a0c85`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3e109a0c85

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 5 Fedora Update System 2026-10-01 01:12:16 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.