CVE-2026-75142

FFmpeg before commit 9d786e4 contains a stack buffer overflow in the MPEG-PS muxer (libavformat/mpegenc.c). When muxing input with more streams than the muxer's fixed-size stack buffer accommodates, the buffer is overflowed. A crafted input with an excessive number of streams triggers the overflow during MPEG-PS 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-121

Affected products

• Ffmpeg (Ffmpeg)

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/9d786e4b5e9b8482651928574de33772aeee7be1
• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24087
• https://www.vulncheck.com/advisories/ffmpeg-stack-buffer-overflow-in-mpeg-ps-muxer-via-mpegenc-c