FFmpeg up to 9.0.2 ARIB Caption Decoding libaribcaption.c aribcaption_trans_text_subtitle rects heap-based overflow

Summaryinfo

A vulnerability labeled as problematic has been found in FFmpeg up to 9.0.2. This impacts the function aribcaption_trans_text_subtitle of the file libavcodec/libaribcaption.c of the component ARIB Caption Decoding. Such manipulation of the argument rects leads to heap-based overflow. This vulnerability is referenced as CVE-2026-125210. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in FFmpeg up to 9.0.2 and classified as problematic. Affected by this issue is the function aribcaption_trans_text_subtitle of the file libavcodec/libaribcaption.c of the component ARIB Caption Decoding. The manipulation of the argument rects with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. The product writes past the end of a buffer that was allocated on the heap. Impacted is confidentiality, integrity, and availability. CVE summarizes:

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in aribcaption_trans_text_subtitle() in libavcodec/libaribcaption.c when decoding with sub_type text. Attackers can supply a crafted ARIB STD-B24 caption stream with zero regions, causing a pointer write past a zero-sized sub->rects allocation and corrupting heap memory.

The advisory is available at code.ffmpeg.org. This vulnerability is handled as CVE-2026-125210 since 11/09/2026. The exploitation is known to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/09/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Multimedia Processing Software

Name

• FFmpeg

Version

• 9.0.0
• 9.0.1
• 9.0.2

License

• open-source

Website

• Product: https://ffmpeg.org/

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