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: 8.4 [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]
CVE-ID: CVE-2025-9951
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
FFmpeg
Ubuntu
ffmpeg (Ubuntu package)
Ubuntu
ffmpeg (Ubuntu package)
How to mitigate CVE-2025-9951
Install update from vendor's website.
FFmpeg - update to 8.0
ffmpeg (Ubuntu package) - addressed in versions 7:3.4.11-0ubuntu0.1+esm11, 7:4.2.7-0ubuntu0.1+esm11, 7:4.4.2-0ubuntu0.22.04.1+esm10, 7:6.1.1-3ubuntu5+esm6
ffmpeg (Ubuntu package) - addressed in versions 7:3.4.11-0ubuntu0.1+esm11, 7:4.2.7-0ubuntu0.1+esm11, 7:4.4.2-0ubuntu0.22.04.1+esm10, 7:6.1.1-3ubuntu5+esm6