Bug 2519643

Summary: CVE-2026-70628 ffmpeg: FFmpeg: Arbitrary code execution via crafted WTV file in DVB subtitle parser [fedora-all]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: ffmpegAssignee: Multimedia SIG <multimedia-sig>
Status: ASSIGNED --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: asn, dominik, multimedia-sig, ngompa13, philip.wyett
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["a286b3df-079b-46e9-805e-2c0af30ce079"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2512243    

Description Ganesh 2026-08-19 14:28:25 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 from 0.5 up to, but not including, 9.0 contain a signed integer overflow vulnerability in the DVB subtitle parser in libavcodec/dvbsub_parser.c that allows attackers to trigger a heap buffer overflow by supplying a crafted WTV file. The overflow causes the bounds-check guard expression to wrap to INT_MIN, bypassing the PARSE_BUF_SIZE comparison and invoking memcpy() with attacker-controlled data into a heap buffer, resulting in an out-of-bounds heap write and potential memory corruption or code execution.
Comment 1 Dominik 'Rathann' Mierzejewski 2026-08-25 10:22:23 UTC 
Fixed in:
master: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/93f2a525ec6c7b467bae68322720d10188fc6e30
9.0: https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/02fc47e13f903768b75f7985a2706a6223ab4506

8.1 and below are affected.