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.
History

Sat, 26 Sep 2026 23:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 24 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Title Signed Integer Overflow in FFmpeg HEIF Parser Leading to Unsafe Integer Handling ffmpeg: FFmpeg: Data corruption and information disclosure via signed integer overflow in HEIF processing
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 23 Sep 2026 16:15:00 +0000

Type Values Removed Values Added
Title Signed Integer Overflow in FFmpeg HEIF Parser Leading to Unsafe Integer Handling

Wed, 23 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
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.
First Time appeared Ffmpeg
Ffmpeg ffmpeg
Weaknesses CWE-190
CPEs cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*
Vendors & Products Ffmpeg
Ffmpeg ffmpeg
References
Metrics cvssV3_1

{'score': 6.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-09-23T14:18:54.929Z

Updated: 2026-09-26T22:51:22.006Z

Reserved: 2026-09-23T14:18:54.578Z

Link: CVE-2026-96611

cve-icon Vulnrichment

Updated: 2026-09-26T22:49:07.487Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-23T15:17:34.160

Modified: 2026-10-15T19:43:29.817

Link: CVE-2026-96611

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-23T14:18:54Z

Links: CVE-2026-96611 - Bugzilla