---
id: "CVE-2026-125189"
page: "https://infrastack.ai/live/CVE-2026-125189"
kind: "vulnerability"
aliases: ["CVE-2026-125189"]
title: "FFmpeg: crafted LCEVC stream crashes applications using the lcevc_metadata filter"
severity: "medium"
cvss: 5.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["ffmpeg", "media-processing", "package", "transcoding"]
not_affected_if: ["no-lcevc-content", "outside-affected-range", "trusted-input-only"]
published_at: "2026-11-09T19:16:54+00:00"
first_seen_at: "2026-11-09T19:28:17+00:00"
updated_at: "2026-11-09T19:32:05+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125189", "first_seen_at": "2026-11-09T19:28:17+00:00"}]
exploit_sources: []
---

# FFmpeg: crafted LCEVC stream crashes applications using the lcevc_metadata filter

Link for people: https://infrastack.ai/live/CVE-2026-125189 (this .md is for agents)

FFmpeg 8.1 through 9.0.2 has a bug in the lcevc_metadata bitstream filter where a crafted LCEVC access unit with two IDR or non-IDR NAL units trips an assertion. The assertion aborts the process, so an attacker can cause a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `ffmpeg -version` and compare against the affected range `8.1` through `9.0.2`.
- Search your code and pipelines for use of the `lcevc_metadata` bitstream filter.

## Timeline

- 2026-11-09T19:28:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125189

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ffmpeg-8.1-through-9.0.2-denial-of-service-via-lcevc-metadata-bitstream-filter
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/0747459f0c6f228566f5cb11ceed56b977208582

## From the sources

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.

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