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

Quick assessment

Affected
FFmpeg FFmpeg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 8.1.2及之前版本存在缓冲区错误漏洞，该漏洞源于vf_hqdn3d filter中基于初始帧宽度分配的每平面行历史缓冲区不足，当滤波器图重新初始化禁用后，后续更大帧导致denoise_spatial()写入超出分配边界，导致堆越界写入，攻击者可通过提供特制视频文件破坏堆内存。

CVSS 8.8 · High EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg ≤ 8.1.2 affected
5d7112c60e6f0f0742ce47d448e6da0718a70f4c unaffected
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I. Basic Information for CVE-2026-66036

Vulnerability Information
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Vulnerability Title
FFmpeg Heap Out-of-Bounds Write in vf_hqdn3d Filter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 8.1.2及之前版本存在缓冲区错误漏洞，该漏洞源于vf_hqdn3d filter中基于初始帧宽度分配的每平面行历史缓冲区不足，当滤波器图重新初始化禁用后，后续更大帧导致denoise_spatial()写入超出分配边界，导致堆越界写入，攻击者可通过提供特制视频文件破坏堆内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FFmpeg FFmpeg 0 ~ 8.1.2 -

II. Public POCs for CVE-2026-66036

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III. Intelligence Information for CVE-2026-66036

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Patches & Fixes for CVE-2026-66036 (2)

Vendor Advisories for CVE-2026-66036 (1)

Same Patch Batch · FFmpeg · 2026-07-24 · 6 CVEs total

CVE-2026-66040 8.8 HIGH FFmpeg Heap Out-of-Bounds Write via PNG/APNG eXIf Encoder
CVE-2026-66041 8.8 HIGH FFmpeg 7.0 - 8.1.2 Heap Out-of-Bounds Write via vf_quirc Filter
CVE-2026-66039 8.8 HIGH FFmpeg MACE6 Audio Decoder Heap Out-of-Bounds Write via CAF File
CVE-2026-66037 6.5 MEDIUM FFmpeg IAMF Demuxer Uncontrolled Resource Consumption via mix_presentation_obu()
CVE-2026-66038 6.5 MEDIUM FFmpeg LCL/ZLIB Video Decoder Information Disclosure via lcldec.c

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-122

V. Comments for CVE-2026-66036

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