FFmpeg up to 9.0.2 ARIB Caption libaribcaption.c aribcaption_trans_ass_subtitle out-of-bounds

Summaryinfo

A vulnerability was found in FFmpeg up to 9.0.2. It has been classified as problematic. Affected by this issue is the function aribcaption_trans_ass_subtitle of the file libavcodec/libaribcaption.c of the component ARIB Caption Handler. This manipulation causes out-of-bounds. This vulnerability is handled as CVE-2026-125211. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability has been found in FFmpeg up to 9.0.2 and classified as problematic. Affected by this vulnerability is the function aribcaption_trans_ass_subtitle of the file libavcodec/libaribcaption.c of the component ARIB Caption Handler. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

FFmpeg through 9.0.2 contains an out-of-bounds read and invalid free vulnerability in aribcaption_trans_ass_subtitle() in libavcodec/libaribcaption.c that frees subtitle rectangles using region_count instead of num_rects. Attackers can supply crafted ARIB captions whose later region exceeds the 8 KiB AVBPrint limit, triggering cleanup that frees out-of-bounds pointers and corrupts the heap.

It is possible to read the advisory at code.ffmpeg.org. This vulnerability is known as CVE-2026-125211 since 11/09/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

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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