PatchTheCVECVE-2026-96611: FFmpeg before 9.0 has a signed integer overflow in libavformat/mov.c
CVE-2026-96611 is a medium-severity flaw (CVSS 6.9) affecting ffmpeg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 v
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.9 (Medium) |
| Attack vector | Local |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.1% (top 99%) |
| CISA exploited list | No |
| Weakness | CWE-190 |
| Published | 2026-09-23 |
| Last modified | 2026-10-15 |
Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-96611?
ffmpeg: upgrade to 9.0. Exact commands for each OS are on this page.
Is CVE-2026-96611 being exploited?
CVE-2026-96611 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-96611 affect?
CVE-2026-96611 affects ffmpeg. Severity is medium (CVSS 6.9). 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
How urgent is CVE-2026-96611?
Priority 24/100. No elevated risk signals yet.
Software pages
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