FFmpeg up to 9.0.2 TDSC Decoder libavcodec/tdsc.c tdsc_load_cursor out-of-bounds

Summaryinfo

A vulnerability has been found in FFmpeg up to 9.0.2 and classified as critical. The impacted element is the function tdsc_load_cursor of the file libavcodec/tdsc.c of the component TDSC Decoder. Performing a manipulation results in out-of-bounds. This vulnerability is known as CVE-2026-125178. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in FFmpeg up to 9.0.2. It has been classified as critical. This affects the function tdsc_load_cursor of the file libavcodec/tdsc.c of the component TDSC Decoder. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

FFmpeg through 9.0.2 contains an out-of-bounds heap read vulnerability in tdsc_load_cursor() in libavcodec/tdsc.c, which stores cursor dimensions before validating them. Attackers can supply a crafted AVI file with oversized TDSC cursor dimensions so tdsc_paint_cursor() reads past the cursor buffer, crashing the decoder or leaking heap memory into frames.

It is possible to read the advisory at code.ffmpeg.org. This vulnerability is uniquely identified as CVE-2026-125178 since 11/09/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. 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.

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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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