CVE-2025-9951
Remote code execution via Heap Buffer Overflow in FFmpeg JPEG2000
- Published
- Sep 9, 2025
- Updated
- Feb 26, 2026
- Assigning CNA
- Evidence observed
- Sep 5, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS: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:XLow · next 30 days
- Percentile
- 37.0%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Proof-of-concept exploit for CVE-2026-22778, an unauthenticated RCE in vLLM's video processing, demonstrating heap address disclosure and a heap buffer overflow in FFmpeg's JPEG2000 decoder. Includes a vulnerable lab for authorized testing.
Responsible use
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