CVE-2026-125261

CVSS 6.9 (medium) · published 2026-11-09

FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the SGI encoder's encode_frame() in libavcodec/sgienc.c, where unsigned size variables mis-handle negative linesize frames. Attackers can supply a video whose display matrix triggers autorotate vflip, so transcoding to SGI images reads pixel data far outside the frame and crashes the process.

Weakness: CWE-125

Source: NVD CVE-2026-125261

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25690
• https://github.com/FFmpeg/FFmpeg
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/sgienc.c#L208
• https://github.com/FFmpeg/FFmpeg/commit/c6e5b6105aa13f6b0df2a646da608078cfe52d79
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-sgi-encoder-out-of-bounds-read-via-sgienc-c

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