ffmpeg: FFmpeg before 9.0 has a signed integer overflow in libavformat/mov.c
CVE-2026-96611 is fixed in ffmpeg on 1 platform, first by DEBIAN-CVE-2026-96611, released September 24, 2026. It is not reported as exploited. Patch Radar priority: High.
FFmpeg before 9.0 has a signed integer overflow in libavformat/mov.c. In mov_read_ispe(), uint32_t width/height values from a crafted HEIF ispe box are stored into signed int fields without bounds checking, allowing values exceeding INT_MAX to become negative. In read_image_grid(), accumulating these values causes signed integer overflow (undefined behavior per C17 section 6.5), which on x86 wraps to a small positive value, bypassing downstream validity checks.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ffmpeg · Debian 13.5 (trixie) | 7:7.1.5-0+deb13u1 | DEBIAN-CVE-2026-96611 | Sep 24, 2026 |
| ffmpeg · Debian 14 | 7:8.1.2-1 | DEBIAN-CVE-2026-96611 | Sep 24, 2026 |
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