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FFmpeg

libav

ffmpeg

FFmpeg versions through 8.1.2 contain a heap out-of-bounds write vulnerability in the vf_hqdn3d filter. This flaw occurs when a crafted video input has increasing frame resolution between frames while filtergraph reinitialization is disabled (-reinit_filter 0). The vulnerability allows heap memory corruption due to undersized buffer allocation for line-history, leading to out-of-bounds writes during denoising operations.

The vulnerability in FFmpeg (libav) up to version 8.1.2 is a heap out-of-bounds write in the vf_hqdn3d filter. When the filtergraph reinitialization is disabled via the -reinit_filter 0 option, and a crafted video input has frames with increasing resolution, the function vf_hqdn3d.config_input() allocates line-history buffers based on the initial frame width. Subsequent larger frames cause denoise_spatial() to write beyond these buffers, corrupting heap memory. This issue is tracked as CVE-2026-66036 and was fixed in commit 5d7112c.

Detailed information about FFmpeg through 8.1.2, fixed in commit 5d7112c, contains a heap out-of-bounds write vulnerability in the vf_hqdn3d filter that allows 

FFmpeg through 8.1.2, fixed in commit 5d7112c, contains a heap out-of-bounds write vulnerability in the vf_hqdn3d filter that allows attackers to… (CVE-2026-66036) - Live Threat Intelligence - Threat Radar | OffSeq.com

Libav: FFmpeg through 8.1.2, fixed in commit 5d7112c, contains a heap out-of-bounds write vulnerability in the vf_hqdn3d filter that allows attackers to… (CVE-2026-66036)

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