CVE-2026-125261: FFmpeg through 9.0.2 SGI Encoder Out-of-Bounds Read via sgienc.c

FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the SGI encoder's encodeframe() 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.