CVE-2026-75142CWE-121

CVE-2026-75142

High · published August 19, 2026

CVSS v3.1

7.8

EPSS

Percentile

9.2

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 7.8 · HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0: 8.5 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS: 0.00199 · 9.2th percentile
Weakness: CWE-121 · Stack-based Buffer Overflow
Published: 2026-08-19T21:21Z

References (3)

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

EPSS history

Timeline

19 AUG 16:24Z
FFmpeg Stack Buffer Overflow in MPEG-PS Muxer via mpegenc.c
cvelistv5