Buffer overflow in Ffmpeg

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.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-75142?
CVE-2026-75142 is a high-severity vulnerability in Ffmpeg, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-08-19.
How severe is CVE-2026-75142?
High severity. CVSS v3 base score is 7.8 out of 10.