CVE-2026-125189 FFmpeg 8.1 through 9.0.2 Denial of Service via lcevc_metadata Bitstream Filter
Medium 5.7
Published
Updated
Check this codebase for CVE-2026-125189 and fix it if it is affected.
What it is: CVE-2026-125189 is a medium-severity vulnerability in FFmpeg, published on 9 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-125189 in the wild and no public exploit code.
Affected product: FFmpeg. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-125189/ (Markdown: https://insights.sbomify.com/CVE-2026-125189/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-125189?
CVE-2026-125189 is a medium-severity vulnerability in FFmpeg, published on 9 Nov 2026.
Official description
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.
Weakness: CWE-617
Which versions are affected by CVE-2026-125189?
How do I fix CVE-2026-125189?
No fix has been published for CVE-2026-125189 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-125189 being exploited?
There is no known exploitation of CVE-2026-125189 in the wild and no public exploit code.
Sources
Also known as GHSA-fphr-r6h2-43vh, UBUNTU-CVE-2026-125189.