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CVE-2026-65705— FFmpeg 3.4 - 8.1.2 vf_floodfill Out-of-Bounds Write via filter_frame()

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 3.4版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于vf_floodfill视频过滤器中的越界写入，当提供动态大小的视频流且禁用过滤器图重新初始化时，可能导致堆损坏和进程崩溃，严重时可执行任意代码。

CVSS 7.8 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg 3.4≤ 8.1.2 affected
f186c50cf53aec20e9a29059cb22ca3f2d59201c unaffected
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I. Basic Information for CVE-2026-65705

Vulnerability Information
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Vulnerability Title
FFmpeg 3.4 - 8.1.2 vf_floodfill Out-of-Bounds Write via filter_frame()
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions 3.4 through 8.1.2 contain an out-of-bounds write vulnerability in the vf_floodfill video filter that allows attackers to corrupt heap memory by supplying a dynamically sized video stream with filtergraph reinitialization disabled via -reinit_filter 0. When config_input() allocates the points traversal stack based on initial frame dimensions and a subsequent larger frame is processed, filter_frame() performs flood-fill neighbor pushes beyond the original allocation boundary, resulting in heap corruption and process crash with potential for code execution depending on heap layout and process hardening.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
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 3.4版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于vf_floodfill视频过滤器中的越界写入，当提供动态大小的视频流且禁用过滤器图重新初始化时，可能导致堆损坏和进程崩溃，严重时可执行任意代码。
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 3.4 ~ 8.1.2 -

II. Public POCs for CVE-2026-65705

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III. Intelligence Information for CVE-2026-65705

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Patches & Fixes for CVE-2026-65705 (2)

Vendor Advisories for CVE-2026-65705 (1)

Same Patch Batch · FFmpeg · 2026-07-23 · 4 CVEs total

CVE-2026-65703 7.8 HIGH FFmpeg 2.7 - 8.1.2 Out-of-Bounds Write in TDSC Video Decoder
CVE-2026-65706 7.8 HIGH FFmpeg 3.0 - 8.1.2 vf_swaprect Out-of-Bounds Write via NV12 Frame Processing
CVE-2026-65704 7.8 HIGH FFmpeg 8.1.2 Out-of-Bounds Write via TY Demuxer and Shorten Decoder

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-787

V. Comments for CVE-2026-65705

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