CVE-2026-40962CWE-190

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

Medium · published April 16, 2026

CVSS v3.1
4.9
EPSS
0%
Percentile
4.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00158 · 4.6th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2026-04-16T01:33Z
EPSS history
Timeline
  • 16 APR 01:33Z
    FFmpeg before 8.1 has an integer overflow and resultant out-of-bounds write via CENC (Common Encryption) subsample data to libavformat/mov.c
    cvelistv5