---
id: CVE-2026-125255
title: FFmpeg through 9.0.2 Use-After-Free in MJPEG Hardware-Accelerated Decoding
summary: >-
  FFmpeg through 9.0.2 contains a use after free vulnerability in
  libavcodec/mjpegdec.c that allows attackers to trigger freed buffer reads by
  sending a SOF marker without a preceding SOI. Attackers can supply crafted
  MJPEG streams causing…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-416
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T19:11:59.708Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125255'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25231'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/f58a6776546567367baf5223df9ffbfd289299f8
    label: Patch Commit
  - url: 'https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/mjpegdec.c#L831'
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-use-after-free-in-mjpeg-hardware-accelerated-decoding
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 Use-After-Free in MJPEG
      Hardware-Accelerated Decoding
tags:
  - cve.org
ingestedAt: '2026-11-09T20:27:27.086Z'
---

## Overview

FFmpeg through 9.0.2 contains a use after free vulnerability in libavcodec/mjpegdec.c that allows attackers to trigger freed buffer reads by sending a SOF marker without a preceding SOI. Attackers can supply crafted MJPEG streams causing ff_mjpeg_decode_sof() to pass a stale raw_image_buffer pointer to hwaccel decoders like NVDEC, crashing applications or leaking heap contents.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.