FFmpeg up to 8.x DVB subtitle parser dvbsub_parser.c memcpy integer overflow

Summaryinfo

A vulnerability labeled as critical has been found in FFmpeg up to 8.x. The impacted element is the function memcpy of the file libavcodec/dvbsub_parser.c of the component DVB subtitle parser. The manipulation results in integer overflow. This vulnerability is cataloged as CVE-2026-70628. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in FFmpeg up to 8.x. It has been classified as critical. Affected is the function memcpy of the file libavcodec/dvbsub_parser.c of the component DVB subtitle parser. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at code.ffmpeg.org. This vulnerability is traded as CVE-2026-70628 since 08/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 9.0 eliminates this vulnerability.

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Productinfo

Type

• Multimedia Processing Software

Name

• FFmpeg

Version

• 8.x

License

• open-source

Website

• Product: https://ffmpeg.org/

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