FFmpeg 8.1.2 Heap OOB Write in vf_hqdn3d Filter
CVE-2026-66036 Published on July 24, 2026
FFmpeg Heap Out-of-Bounds Write in vf_hqdn3d Filter
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.
Vulnerability Analysis
CVE-2026-66036 is exploitable with network access. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-66036
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Affected Versions
FFmpeg:- Before and including 8.1.2 is affected.
- Version 5d7112c60e6f0f0742ce47d448e6da0718a70f4c is unaffected.