Integer Overflow or Wraparound Affecting ffmpeg package, versions [,8.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-CONAN-FFMPEG-16082555
- published16 Apr 2026
- disclosed16 Apr 2026
- creditQuang Luong
Introduced: 16 Apr 2026
NewCVE-2026-40962 (opens in a new tab)How to fix?
Upgrade ffmpeg to version 8.1 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the cenc_scheme_decrypt, cbc1_scheme_decrypt, cens_scheme_decrypt, and cbcs_scheme_decrypt paths in libavformat/mov.c. An attacker can trigger out-of-bounds subsample size validation by supplying a crafted MOV/MP4 file with large CENC subsample length fields. This results in invalid memory access and a crash when FFmpeg processes the file.