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CVE-2026-8461— Heap out-of-bounds write via odd slice_height in FFmpeg MagicYUV decoder

Quick assessment

Affected
FFmpeg FFmpeg
Exploitation
Public or AI PoC available; prioritize validation
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之前版本存在缓冲区错误漏洞，该漏洞源于libavcodec库MagicYUV解码器存在越界写入，可能导致拒绝服务和远程代码执行。

CVSS 8.8 · High EPSS 1.57% · P73

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg < 8.1.2 affected
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I. Basic Information for CVE-2026-8461

Vulnerability Information
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Vulnerability Title
Heap out-of-bounds write via odd slice_height in FFmpeg MagicYUV decoder
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds write vulnerability in FFmpeg's libavcodec library, specifically in the MagicYUV decoder, allows denial-of-service and, in some cases, can be exploited for remote code execution. This vulnerability is associated with the file libavcodec/magicyuv.C. This issue affects FFmpeg before version 8.1.2.
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
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 8.1.2之前版本存在缓冲区错误漏洞，该漏洞源于libavcodec库MagicYUV解码器存在越界写入，可能导致拒绝服务和远程代码执行。
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-2026-8461

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
default-local-qwen3.6 · 11587 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-8461

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Patches & Fixes for CVE-2026-8461 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-8461

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