Bug 2512243 (CVE-2026-70628)

Summary: CVE-2026-70628 ffmpeg: FFmpeg: Arbitrary code execution via crafted WTV file in DVB subtitle parser
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: bbrownin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FFmpeg. An attacker could exploit a signed integer overflow vulnerability within the DVB subtitle parser by providing a specially crafted WTV (Windows Recorded TV Show) file. This overflow can lead to a heap buffer overflow, enabling out-of-bounds memory writes. The consequence of this vulnerability is potential memory corruption or arbitrary code execution.
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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: 2519639, 2519640, 2519641, 2519642, 2519643, 2548055    
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Description OSIDB Bzimport 2026-08-06 22:24:30 UTC 
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.