CVE-2026-125239 FFmpeg through 9.0.2 Heap Buffer Overflow via HEVC DXVA Tile Parameters

High 7.3 Published 9 Nov 2026 Updated 10 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-125239?

CVE-2026-125239 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026.

Official description

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in ff_dxva2_hevc_fill_picture_parameters() that allows attackers to corrupt memory via unbounded non-uniform tile counts. Attackers can supply crafted HEVC bitstreams with many non-uniformly spaced tiles to write controlled 16-bit values past fixed-size DXVA arrays during DXVA2, D3D11VA, or D3D12VA decoding on Windows.

Weakness: CWE-787

Which versions are affected by CVE-2026-125239?

How do I fix CVE-2026-125239?

No fix has been published for CVE-2026-125239 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-125239 being exploited?

There is no known exploitation of CVE-2026-125239 in the wild and no public exploit code.

Sources

Also known as GHSA-cj9x-468j-6qgp, UBUNTU-CVE-2026-125239.