FFmpeg: Heap buffer overflow in ff_dxva2_hevc_fill_picture_parameters (CVE-2026-125239)
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 crafted HEVC bitstreams during hardware-accelerated decoding on Windows.
CVE search metadata
CVE search record: CVE-2026-125239. Severity: high. CVSS: 7.0. KEV: no. Product: FFmpeg (<= 9.0.2). Brief: FFmpeg: Heap buffer overflow in ff_dxva2_hevc_fill_picture_parameters (CVE-2026-125239). Brief link: https://feed.craftedsignal.io/briefs/2026-11-ffmpeg-heap-overflow-53a04cca/
Triage facts
Revision 1- Applicability
- FFmpeg (<= 9.0.2)
- Evidence
- Unknown
- Severity
- High
- Sources
- 1 public source
- Freshness
- Revision 1Nov 9, 19:55 UTC
- Vulnerabilities
- 1 CVE
- Source quality
- A2Roughly even chance
FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in the function ff_dxva2_hevc_fill_picture_parameters(). Attackers can supply crafted HEVC bitstreams with many non-uniformly spaced tiles to write controlled 16-bit values past fixed-size DXVA arrays. This issue occurs during DXVA2, D3D11VA, or D3D12VA decoding on Windows.