FFmpeg up to 9.0.2 WavPack Encoder libavcodec/wavpackenc.c wavpack_encode_init integer overflow

Summaryinfo

A vulnerability categorized as problematic has been discovered in FFmpeg up to 9.0.2. Impacted is the function wavpack_encode_init of the file libavcodec/wavpackenc.c of the component WavPack Encoder. The manipulation results in integer overflow. This vulnerability is known as CVE-2026-125234. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in FFmpeg up to 9.0.2. Affected is the function wavpack_encode_init of the file libavcodec/wavpackenc.c of the component WavPack Encoder. 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 availability. CVE summarizes:

FFmpeg through 9.0.2 contains an integer overflow vulnerability in wavpack_encode_init() in libavcodec/wavpackenc.c that causes an infinite loop when computing block size from sample rate and channel count. Attackers can supply a crafted audio file, such as a WAV header declaring a huge sample rate with many channels, to hang applications transcoding to WavPack.

The advisory is available at code.ffmpeg.org. This vulnerability is traded as CVE-2026-125234 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.

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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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