---
id: CVE-2026-125227
title: >-
  FFmpeg through 9.0.2 Heap Buffer Overflow via cbs_jpeg_write_scan Integer
  Overflow
summary: >-
  FFmpeg through 9.0.2 contains an integer overflow in cbs_jpeg_write_scan() in
  libavcodec/cbs_jpeg.c that causes a heap buffer overflow on 32-bit builds.
  Attackers can supply a crafted MJPEG/JPEG stream with a scan of 512 MiB or
  more, pro…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-190
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T19:11:40.151Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125227'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25232'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/b89ce54d93bf644433dfa9fbc34f19c22237691a
    label: Patch Commit
  - url: 'https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cbs_jpeg.c#L299'
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-heap-buffer-overflow-via-cbs-jpeg-write-scan-integer-overflow
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 Heap Buffer Overflow via
      cbs_jpeg_write_scan Integer Overflow
tags:
  - cve.org
ingestedAt: '2026-11-09T19:18:02.588Z'
---

## Overview

FFmpeg through 9.0.2 contains an integer overflow in cbs_jpeg_write_scan() in libavcodec/cbs_jpeg.c that causes a heap buffer overflow on 32-bit builds. Attackers can supply a crafted MJPEG/JPEG stream with a scan of 512 MiB or more, processed by CBS bitstream filters like filter_units, to corrupt the heap or crash the application.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

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