Heap-based buffer overflow in FFmpeg - CVE-2025-9951
Published: October 27, 2025 / Updated: June 23, 2026
Vulnerability identifier: #VU117664
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2025-9951
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
FFmpeg
Ubuntu
ffmpeg (Ubuntu package)
FFmpeg
Ubuntu
ffmpeg (Ubuntu package)
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when handling JPEG2000 images. A remote attacker can pass specially crafted image to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2025-9951
Install update from vendor's website.