FFmpeg up to 9.0.2 Vulkan encoder ffv1enc_vulkan.c integer overflow

Summaryinfo

A vulnerability was found in FFmpeg up to 9.0.2. It has been classified as problematic. Impacted is an unknown function of the file libavcodec/ffv1enc_vulkan.c of the component Vulkan encoder. The manipulation leads to integer overflow. This vulnerability is documented as CVE-2026-125248. The attack needs to be performed locally. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in FFmpeg up to 9.0.2. This issue affects an unknown code block of the file libavcodec/ffv1enc_vulkan.c of the component Vulkan encoder. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

FFmpeg 9.0 through 9.0.2 contains an integer overflow vulnerability in libavcodec/ffv1enc_vulkan.c that undersizes the float remap GPU buffer for large frames. Attackers can supply large GBRPF32 or GBRAPF32 images or videos that, when transcoded to FFV1 with the Vulkan encoder, trigger out-of-bounds GPU memory writes causing crashes or memory corruption.

The advisory is shared at code.ffmpeg.org. The identification of this vulnerability is CVE-2026-125248 since 11/09/2026. The exploitation is known 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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