CVE-2026-65706

Heap corruption via undersized chroma row buffer

Published Jul 23, 2026 · Updated Jul 23, 2026

Out-of-bounds write in FFmpeg 3.0 through 8.1.2 allows local users to corrupt heap memory via a crafted odd-width NV12 frame. The vf_swaprect filter_frame() path allocates a 17-byte row buffer using plane 0's one-byte step, then copies an 18-byte chroma row into it. Triggering requires the crafted frame to reach vf_swaprect; the overwrite crashes the process and creates code-execution potential in its context.

CVSS severity8.5
High
EPSS probability0.13%
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 write in FFmpeg 3.0 through 8.1.2 allows local users to corrupt heap memory via a crafted odd-width NV12 frame. The vf_swaprect filter_frame() path allocates a 17-byte row buffer using plane 0's one-byte step, then copies an 18-byte chroma row into it. Triggering requires the crafted frame to reach vf_swaprect; the overwrite crashes the process and creates code-execution potential in its context.

The record

CVE
CVE-2026-65706
Published
Jul 23, 2026
Updated
Jul 23, 2026
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-131, CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 23, 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=3.0 <=8.1.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

FFmpeg · FFmpegversion=3.0 <=8.1.2

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-131Incorrect Calculation of Buffer Size
CWE-787Out-of-bounds Write
T1204.002User Execution: Malicious File

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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