CVE-2026-65706: Ffmpeg

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Ffmpeg Ffmpeg: from 3.0, up to and including 8.1.2

Published 2026-07-23. Last modified 2026-08-07.