FFmpeg up to 9.0.2 libavcodec libavcodec/cbs_vp9.c cbs_vp9_split_fragment integer overflow

Summaryinfo

A vulnerability has been found in FFmpeg up to 9.0.2 and classified as problematic. Impacted is the function cbs_vp9_split_fragment of the file libavcodec/cbs_vp9.c of the component libavcodec. Performing a manipulation results in integer overflow. This vulnerability is reported as CVE-2026-125253. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in FFmpeg up to 9.0.2. This affects the function cbs_vp9_split_fragment of the file libavcodec/cbs_vp9.c of the component libavcodec. 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. The summary by CVE is:

FFmpeg through 9.0.2 contains an integer overflow in cbs_vp9_split_fragment() in libavcodec/cbs_vp9.c that wraps the superframe size check on 32-bit builds. Attackers can supply a crafted VP9 packet with a forged superframe index containing near-2^32 frame sizes, causing out-of-bounds reads that crash 32-bit applications.

The advisory is shared at code.ffmpeg.org. This vulnerability is uniquely identified as CVE-2026-125253 since 11/09/2026. The exploitability is told 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.

If you want to get the best quality for vulnerability data then you always have to consider 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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