---
id: CVE-2026-125232
title: FFmpeg through 9.0.2 Division by Zero in B-frame Motion Estimation
summary: >-
  FFmpeg through 9.0.2 contains a division by zero vulnerability in
  estimate_motion_b() in libavcodec/motion_est.c, caused by frame timestamp
  distances truncated to 16 bits. Attackers can supply input with timestamp gaps
  that are multiples…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-369
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg <= 9.0.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-09T20:57:41.697888Z'
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T21:06:54.183Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125232'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24552'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/bf0a2e4680df92d8de6514090d350152eb7845b8
    label: Patch Commit
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/16d19ccbce802634662a9bf18a5679cf27da2848
    label: Patch Commit
  - url: 'https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/motion_est.c#L1153'
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-division-by-zero-in-b-frame-motion-estimation
    label: >-
      VulnCheck Advisory: FFmpeg through 9.0.2 Division by Zero in B-frame
      Motion Estimation
tags:
  - cve.org
ingestedAt: '2026-11-09T19:18:02.584Z'
---

## Overview

FFmpeg through 9.0.2 contains a division by zero vulnerability in estimate_motion_b() in libavcodec/motion_est.c, caused by frame timestamp distances truncated to 16 bits. Attackers can supply input with timestamp gaps that are multiples of 65536, crashing MPEG-4 Part 2 or MPEG-1/2 B-frame encoding with SIGFPE.

## Affected

- `FFmpeg <= 9.0.2`

## Remediation

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