FFmpeg up to 8.1.2 vf_hqdn3d filter vf_hqdn3d.config_input/denoise_spatial heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in FFmpeg up to 8.1.2. This issue affects the function vf_hqdn3d.config_input/denoise_spatial of the component vf_hqdn3d filter. Performing a manipulation results in heap-based overflow. This vulnerability was named CVE-2026-66036. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in FFmpeg up to 8.1.2. This affects the function vf_hqdn3d.config_input/denoise_spatial of the component vf_hqdn3d filter. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. 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(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at code.ffmpeg.org. This vulnerability is uniquely identified as CVE-2026-66036 since 07/23/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Applying the patch 5d7112c60e6f0f0742ce47d448e6da0718a70f4c is able to eliminate this problem.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Multimedia Processing Software

Name

• FFmpeg

Version

• 8.1.0
• 8.1.1
• 8.1.2

License

• open-source

Website

• Product: https://ffmpeg.org/

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