FFmpeg through 9.0.2 Heap Buffer Overflow via HEVC DXVA Tile Parameters

Advisories

FFmpeg through 9.0.2 Heap Buffer Overflow via HEVC DXVA Tile Parameters

Severity: high
Date: 11/9/2026
Affecting: FFmpeg <= 9.0.2
CVE: CVE-2026-125239
CWE: CWE-787 Out-of-bounds Write
CVSS: 7.3
CVSS V4 Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25136
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/dxva2_hevc.c#L151
https://github.com/FFmpeg/FFmpeg
Credit: Joshua Rogers (AISLE Research), Michael Niedermayer
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.

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