FFmpeg up to 9.0.2 ProRes Encoder ff_prores_kostya_encode_init integer overflow

Summaryinfo

A vulnerability marked as problematic has been reported in FFmpeg up to 9.0.2. The impacted element is the function ff_prores_kostya_encode_init of the component ProRes Encoder. This manipulation causes integer overflow. This vulnerability is tracked as CVE-2026-125259. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in FFmpeg up to 9.0.2. Affected by this vulnerability is the function ff_prores_kostya_encode_init of the component ProRes Encoder. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is 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 occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

FFmpeg through 9.0.2 contains an integer overflow vulnerability in ff_prores_kostya_encode_init() that miscalculates frame_size_upper_bound using 32-bit arithmetic for large frame dimensions. Attackers can supply a high-resolution video transcoded with the prores_ks encoder, causing encode_frame() to write slices past an undersized packet buffer and corrupt heap memory.

The advisory is shared at code.ffmpeg.org. This vulnerability is known as CVE-2026-125259 since 11/09/2026. The exploitation appears to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around 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.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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