CVE-2026-75141 FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing
A heap buffer overflow in FFmpeg's HEVC muxing allows attackers to execute arbitrary code or cause denial of service via crafted input 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-2026-75141?
CVE-2026-75141 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 acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing a heap buffer overflow. A crafted HEVC input file triggers the overflow during muxing.
Weakness: CWE-122
Which versions are affected by CVE-2026-75141?
How do I fix CVE-2026-75141?
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-2026-75141 being exploited?
There is no known exploitation of CVE-2026-75141 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-75141, ECHO-ef47-70d2-abed, GHSA-72cw-2m7j-25c8, UBUNTU-CVE-2026-75141.