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MEDIUM · 4.9

CVE-2026-40962

FFmpeg before 8.1 has an integer overflow and resultant out-of-bounds write via CENC (Common Encryption) subsample data to libavformat/mov.c.

Vulnerability Description

FFmpeg before 8.1 has an integer overflow and resultant out-of-bounds write via CENC (Common Encryption) subsample data to libavformat/mov.c.

CVSS Score

4.9

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW

Affected Products

VendorProductVersions
FfmpegFfmpeg< 8.1

Related Weaknesses (CWE)

CWE-190

References

FAQ

What is CVE-2026-40962?

CVE-2026-40962 is a vulnerability with a CVSS score of 4.9 (MEDIUM). FFmpeg before 8.1 has an integer overflow and resultant out-of-bounds write via CENC (Common Encryption) subsample data to libavformat/mov.c.

How severe is CVE-2026-40962?

CVE-2026-40962 has been rated MEDIUM with a CVSS base score of 4.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-40962?

Check the references section above for vendor advisories and patch information. Affected products include: Ffmpeg Ffmpeg.