CVE-2026-75142

High

Description

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.

SeverityHigh

CVSS7.8

Exploit probability—

ProductFFmpeg

PublishedAug 19, 2026

First seenAug 19, 2026

Weakness typeCWE-121CWE-121

How to fix

Update

FFmpeg FFmpeg9d786e4b5e9b8482651928574de33772aeee7be1 or later

Patches

code.ffmpeg.org/FFmpeg/FFmpeg/commit/9d786e4b5e9b8482651928574de33772aeee7be1

Affected products

Product	Affected versions	Fixed in
FFmpeg FFmpeg	v < 9d786e4b5e9b8482651928574de33772aeee7be1	9d786e4b5e9b8482651928574de33772aeee7be1

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