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CVE-2026-70632— FFmpeg 4.4 < 9.0 Heap Out-of-Bounds Write in CFHD Decoder via AVI Demuxing

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组织开源的一个多媒体处理框架。 FFmpeg 4.4版本至9.0之前版本存在缓冲区错误漏洞，该漏洞源于原生GoPro CineForm HD解码器的cfhd_decode()函数未正确执行非Bayer逻辑输出宽度检查，导致越界堆写入，可能破坏堆内存，并可通过覆盖清理回调指针升级为任意代码执行。

CVSS 7.8 · High EPSS 0.20% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg 4.4< 9.0 affected
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I. Basic Information for CVE-2026-70632

Vulnerability Information
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Vulnerability Title
FFmpeg 4.4 < 9.0 Heap Out-of-Bounds Write in CFHD Decoder via AVI Demuxing
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions from 4.4 up to, but not including, 9.0 contain an out-of-bounds heap write vulnerability in the native GoPro CineForm HD (CFHD) decoder that allows remote attackers to corrupt heap memory by supplying a crafted AVI file during stream probing. The cfhd_decode() function fails to enforce the non-Bayer logical output-width invariant in the transform-type-2 reconstruction path, causing horiz_filter_clip() to write oversized 16-bit sample rows far beyond the allocated output frame buffer, which can be escalated to arbitrary code execution via overwrite of a live cleanup callback pointer.
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组织开源的一个多媒体处理框架。 FFmpeg 4.4版本至9.0之前版本存在缓冲区错误漏洞，该漏洞源于原生GoPro CineForm HD解码器的cfhd_decode()函数未正确执行非Bayer逻辑输出宽度检查，导致越界堆写入，可能破坏堆内存，并可通过覆盖清理回调指针升级为任意代码执行。
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 4.4 ~ 9.0 -

II. Public POCs for CVE-2026-70632

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III. Intelligence Information for CVE-2026-70632

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Patches & Fixes for CVE-2026-70632 (3)

Vendor Advisories for CVE-2026-70632 (1)

Same Patch Batch · FFmpeg · 2026-08-06 · 5 CVEs total

CVE-2026-70628 7.8 HIGH FFmpeg 0.5 < 9.0 DVB Subtitle Parser Heap Buffer Overflow via WTV File
CVE-2026-70630 5.5 MEDIUM FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in Screenpresso Decoder
CVE-2026-70629 5.5 MEDIUM FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in RSCC Decoder
CVE-2026-70631 5.5 MEDIUM FFmpeg 0.5 < 9.0 Uninitialized Heap Memory Read in TIFF Decoder

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-70632

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