CVE-2026-65706 FFmpeg 3.0 - 8.1.2 vf_swaprect Out-of-Bounds Write via NV12 Frame Processing
Attackers can trigger heap corruption and potential code execution in FFmpeg by supplying crafted NV12 video frames to the swaprect filter.
- 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-2026-65706?
CVE-2026-65706 is a high-severity memory corruption vulnerability in Ffmpeg Ffmpeg, published on 23 Jul 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 versions 3.0 through 8.1.2 contain an out-of-bounds write vulnerability in the vf_swaprect video filter that allows attackers to corrupt heap memory by supplying a crafted NV12 video frame with odd width dimensions. The filter_frame() function reuses a temporary row buffer sized for plane 0's single-byte pixel step across all planes, causing an 18-byte memcpy into a 17-byte heap allocation when processing the two-byte-per-sample interleaved chroma plane of a 17x16 NV12 frame, resulting in heap corruption and process crash with potential for code execution.
Which versions are affected by CVE-2026-65706?
It affects 1 product.
Products include Ffmpeg Ffmpeg.
How do I fix CVE-2026-65706?
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-2026-65706 being exploited?
There is no known exploitation of CVE-2026-65706 in the wild and no public exploit code.
Other vulnerabilities in Ffmpeg Ffmpeg
Sources
Also known as DEBIAN-CVE-2026-65706, ECHO-4281-1691-127e, GHSA-g9rh-4g64-7qxg, JLSEC-2026-1181, MINI-5rw3-4jw4-fh4r, UBUNTU-CVE-2026-65706.