CVE-2026-75141

FFmpeg before commit acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing a heap buffer overflow. A crafted HEVC input file triggers the overflow during muxing.

Score

CVSS 4.0 8.5 High

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-08-19

Last modified

2026-10-27

Weaknesses

CWE-122

Affected products

• Ffmpeg (Ffmpeg)

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781
• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24088
• https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-in-hvcc-box-writer-via-hevc-muxing