CVE-2026-96611
Medium
Description
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.
SeverityMedium
CVSS6.9
Exploit probability—
ProductFfmpeg
PublishedSep 23, 2026
First seenSep 23, 2026
Weakness typeCWE-190Integer overflow
How to fix
Update
- ffmpeg ffmpeg9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ffmpeg ffmpeg | v < 9.0 | 9.0 |
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