CVE-2026-96611

ffmpeg: FFmpeg: Data corruption and information disclosure via signed integer overflow in HEIF processing

Published Sep 23, 2026 CVSS 3.1 · 6.9 Medium EPSS < 1% KEV · Not listed
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

Vendor Solution

Update to FFmpeg commit 059eb2e853 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 26, 2026, 10:51 PM
Reserved
Sep 23, 2026, 2:18 PM
Status
Analyzed
Published
Sep 23, 2026, 3:17 PM
Modified
Oct 15, 2026, 7:43 PM
Severity
Moderate
Public date
Sep 23, 2026, 2:18 PM