Integer Overflow or Wraparound Affecting ffmpeg package, versions [,9.0.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Sept 2026
- disclosed23 Sept 2026
Introduced: 23 Sep 2026
NewCVE-2026-96611 (opens in a new tab)How to fix?
Upgrade ffmpeg to version 9.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound via the mov_read_ispe and read_image_grid paths in libavformat/mov.c. An attacker can trigger the flaw by supplying a crafted HEIF file with oversized ispe width and height values, causing them to be stored as negative int values and then summed into coded_width and coded_height during grid assembly. This can make the dimension calculations wrap on x86 and bypass downstream validity checks, leading to incorrect HEIF image parsing and potential denial of service or other unsafe behavior when FFmpeg processes the malformed image grid.