FFmpeg up to 9.0.2 Vulkan Decoder vulkan_decode.c ff_vk_decode_add_slice integer overflow

Summaryinfo

A vulnerability labeled as critical has been found in FFmpeg up to 9.0.2. This issue affects the function ff_vk_decode_add_slice of the file libavcodec/vulkan_decode.c of the component Vulkan Decoder. The manipulation results in integer overflow. This vulnerability was named CVE-2026-125249. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in FFmpeg up to 9.0.2. It has been classified as critical. Affected is the function ff_vk_decode_add_slice of the file libavcodec/vulkan_decode.c of the component Vulkan Decoder. 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 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

FFmpeg 7.1 through 9.0.2 contains an integer overflow in ff_vk_decode_add_slice() in libavcodec/vulkan_decode.c that miscalculates the Vulkan hwaccel bitstream buffer size. Attackers can supply a crafted stream with over 2 GiB of slice data per frame, causing memcpy() to write past a smaller pooled host-mapped buffer.

The advisory is available at code.ffmpeg.org. This vulnerability is traded as CVE-2026-125249 since 11/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. 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.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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