What’s Vulnerable › Vulnerabilities

CVE-2026-96611

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-23 · updated 2026-10-15
• Weakness: CWE-190

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.

Affected products

• FFmpeg: before 9.0 — fixed in 9.0

How to fix

Upgrade to a fixed version: FFmpeg 9.0. Check the vendor advisory for mitigations.

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/059eb2e853c1f62b8df1b73be9318061a7a21b0b
• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23455

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