CVE-2025-9951

Remote code execution via Heap Buffer Overflow in FFmpeg JPEG2000

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

FFmpeg

CVSS v4.0 GOOGLE

7.2 HIGHCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

0.44% chance of exploitation in the next 30 days, 37th percentile

Published

2025-09-09

Updated

2026-02-26

Proof-of-concept exploits (1)

• fm0ss/cve-2025-9951-ffmpeg-jp2-poc0★ · 2026-07-27

References

• CVE Record
• NVD entry