CVE-2026-66036 – FFmpeg Heap Out-of-Bounds Write in vf_hqdn3d Filter

CVE ID :CVE-2026-66036

Published : July 24, 2026, 7:34 p.m. | 16 minutes ago

Description :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 corrupt heap memory by supplying a crafted video whose frame resolution increases between frames when filtergraph reinitialization is disabled via the -reinit_filter 0 option. Attackers can provide a malicious video input where vf_hqdn3d.config_input() allocates undersized per-plane line-history buffers based on the initial frame width, and subsequent larger frames cause denoise_spatial() to write beyond the allocation boundary, resulting in heap memory corruption.

Severity: 8.8 | HIGH

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