---
id: CVE-2026-125189
title: FFmpeg 8.1 through 9.0.2 Denial of Service via lcevc_metadata Bitstream Filter
summary: >-
  FFmpeg 8.1 through 9.0.2 contains a denial of service vulnerability in the
  lcevc_metadata bitstream filter caused by a process block position mismatch in
  lcevc_metadata_handle_vui(). Attackers can supply crafted LCEVC access units
  with t…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-617
vendor: FFmpeg
product: FFmpeg
affected:
  - FFmpeg >= 8.1 <= 9.0.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-09T21:02:13.028798Z'
published: '2026-11-09'
updated: '2026-11-09'
sourceUpdated: '2026-11-09T21:06:57.282Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-125189'
references:
  - url: 'https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25408'
  - url: >-
      https://github.com/FFmpeg/FFmpeg/commit/0747459f0c6f228566f5cb11ceed56b977208582
    label: Patch Commit
  - url: >-
      https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/bsf/lcevc_metadata.c#L103
  - url: 'https://github.com/FFmpeg/FFmpeg'
  - url: >-
      https://www.vulncheck.com/advisories/ffmpeg-8.1-through-9.0.2-denial-of-service-via-lcevc-metadata-bitstream-filter
    label: >-
      VulnCheck Advisory: FFmpeg 8.1 through 9.0.2 Denial of Service via
      lcevc_metadata Bitstream Filter
tags:
  - cve.org
ingestedAt: '2026-11-09T19:18:02.609Z'
---

## Overview

FFmpeg 8.1 through 9.0.2 contains a denial of service vulnerability in the lcevc_metadata bitstream filter caused by a process block position mismatch in lcevc_metadata_handle_vui(). Attackers can supply crafted LCEVC access units with two IDR or non-IDR NAL units to trigger an av_assert0 failure in ff_cbs_lcevc_list_add(), aborting the application.

## Affected

- `FFmpeg >= 8.1 <= 9.0.2`

## Remediation

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