Memory Leak Vulnerability in FFmpeg Affects Media Decoding
CVE-2026-125245

5.7MEDIUM

Key Information:

Vendor

Ffmpeg

Status
Ffmpeg
Vendor
CVE Published:
9 November 2026

What is CVE-2026-125245?

FFmpeg versions up to 9.0.2 are impacted by a memory leak stemming from the ff_mjpeg_decode_sof() function in libavcodec/mjpegdec.c. This vulnerability occurs when malicious users send specially crafted MJPEG streams containing repeated Start of Frame (SOF) markers or corrupted frames. As a result, the hwaccel_picture_private pointer is overwritten without appropriate memory deallocation, leading to potential leaking of sensitive hardware-accelerated buffers and private data utilized in VAAPI or NVDEC decoding processes.

Affected Version(s)

FFmpeg 0 <= 9.0.2

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25231
issue-tracking
https://github.com/FFmpeg/FFmpeg/commit/50e9ef29be1766404...
patch
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/m...
technical-description

CVSS V4

Score:
5.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joshua Rogers (AISLE Research)
Lynne
.