CVE-2026-70632

Code execution via CFHD row-width overflow

Published Aug 6, 2026 · Updated Aug 6, 2026

Out-of-bounds heap write in FFmpeg 4.4 and later before 9.0 allows attackers to execute code by processing a crafted AVI file. The cfhd_decode() transform-type-2 path fails to enforce the non-Bayer logical output width, so horiz_filter_clip() writes oversized 16-bit rows beyond the allocated frame buffer. Processing attacker-supplied CFHD content is required, and corruption of a live cleanup callback pointer enables code execution in the FFmpeg process.

CVSS severity8.5
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds heap write in FFmpeg 4.4 and later before 9.0 allows attackers to execute code by processing a crafted AVI file. The cfhd_decode() transform-type-2 path fails to enforce the non-Bayer logical output width, so horiz_filter_clip() writes oversized 16-bit rows beyond the allocated frame buffer. Processing attacker-supplied CFHD content is required, and corruption of a live cleanup callback pointer enables code execution in the FFmpeg process.

The record

CVE
CVE-2026-70632
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.4 <9.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

FFmpeg · FFmpegversion=4.4 <9.0

Published CVSS scores

8.5VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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