---
id: CVE-2026-125270
title: FFmpeg through 9.0.2 Heap Out-of-Bounds Read in V4L2 M2M Encoder
summary: >-
  FFmpeg through 9.0.2 contains a heap out-of-bounds read vulnerability in
  v4l2_buffer_swframe_to_buf() in libavcodec/v4l2_buffers.c that mishandles
  frames with negative linesize. Attackers can supply bottom-up AVI or PNM/PFM
  files that ar…
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-125
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T19:12:10.299Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125270'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24328'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/b8f159858e2fd29dae4fa34d9e713bbf9bbf190e
    label: Patch Commit
  - url: >-
      https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/v4l2_buffers.c#L410
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-heap-out-of-bounds-read-in-v4l2-m2m-encoder
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 Heap Out-of-Bounds Read in V4L2
      M2M Encoder
tags:
  - cve.org
ingestedAt: '2026-11-09T20:27:27.073Z'
---

## Overview

FFmpeg through 9.0.2 contains a heap out-of-bounds read vulnerability in v4l2_buffer_swframe_to_buf() in libavcodec/v4l2_buffers.c that mishandles frames with negative linesize. Attackers can supply bottom-up AVI or PNM/PFM files that are transcoded to a V4L2 M2M encoder, crashing the application or leaking heap memory into encoded output.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

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