CVE-2026-75142 FFmpeg Stack Buffer Overflow in MPEG-PS Muxer via mpegenc.c
A stack buffer overflow in FFmpeg's MPEG-PS muxer allows attackers to execute arbitrary code or cause denial of service via crafted media files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-75142?
CVE-2026-75142 is a high-severity memory corruption vulnerability in FFmpeg, published on 19 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2026-75142?
How do I fix CVE-2026-75142?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-75142 being exploited?
There is no known exploitation of CVE-2026-75142 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-75142, ECHO-8340-2df2-4096, GHSA-5vj8-jgqj-77h6, UBUNTU-CVE-2026-75142.