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CVE-2026-96611

6.9 · MEDIUM

FFmpeg before 9.0 has a signed integer overflow in libavformat/mov.c.

Published Sep 23, 2026ffmpegCWE-190EPSS 0.11%

Overview

CVE-2026-96611 is a medium-severity vulnerability affecting ffmpeg ffmpeg. It was published on September 23, 2026 and has a CVSS 3.1 base score of 6.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from ffmpeg. Update ffmpeg to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
ffmpegffmpeg>= 0, < 9.0Affected

References

Refcode.ffmpeg.org/FFmpeg/FFmpeg/commit/059eb2e853c1f62b8df1b73be9318061a7a21b0bRefcode.ffmpeg.org/FFmpeg/FFmpeg/pulls/23455

How CyberStrike helps

Frequently asked questions

What is CVE-2026-96611?

CVE-2026-96611 is a medium-severity vulnerability affecting ffmpeg ffmpeg. It was published on September 23, 2026 and has a CVSS 3.1 base score of 6.9 (MEDIUM).

How severe is CVE-2026-96611?

This vulnerability has a CVSS 3.1 base score of 6.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-96611?

Check the references section for vendor advisories and patches from ffmpeg. Update ffmpeg to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-96611?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-96611 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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