FFmpeg up to 9.0.2 CBS Bitstream Filters libavcodec/cbs_jpeg.c cbs_jpeg_write_scan integer overflow

Summaryinfo

A vulnerability, which was classified as problematic, has been found in FFmpeg up to 9.0.2. This impacts the function cbs_jpeg_write_scan of the file libavcodec/cbs_jpeg.c of the component CBS Bitstream Filters. The manipulation leads to integer overflow. This vulnerability is listed as CVE-2026-125227. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in FFmpeg up to 9.0.2. This issue affects the function cbs_jpeg_write_scan of the file libavcodec/cbs_jpeg.c of the component CBS Bitstream Filters. 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 through 9.0.2 contains an integer overflow in cbs_jpeg_write_scan() in libavcodec/cbs_jpeg.c that causes a heap buffer overflow on 32-bit builds. Attackers can supply a crafted MJPEG/JPEG stream with a scan of 512 MiB or more, processed by CBS bitstream filters like filter_units, to corrupt the heap or crash the application.

It is possible to read the advisory at code.ffmpeg.org. The identification of this vulnerability is CVE-2026-125227 since 11/09/2026. The exploitation is known 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. The pricing 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.

Be aware that VulDB is the high quality source for 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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