CVE-2025-9951: Ffmpeg

High severity, CVSS 7.2. EPSS: 0.4% chance of exploitation in the next 30 days.

A heap-buffer-overflow write exists in jpeg2000dec FFmpeg which allows an attacker to potentially gain remote code execution or cause denial of service via the channel definition cdef atom of JPEG2000.

Affected products

• Ffmpeg Ffmpeg: before 8.0 (fixed in 8.0)

Published 2025-09-09. Last modified 2026-06-17.