CVE-2026-66037Network attack vector

Process memory exhaustion via unchecked IAMF count

Published Jul 24, 2026 · Updated Jul 24, 2026

Uncontrolled resource consumption in FFmpeg 8.1.2 and earlier allows remote attackers to exhaust process memory through a crafted IAMF file. The IAMF demuxer's mix_presentation_obu() allocates a language-label array from count_label before checking that the OBU contains matching data. Parsing or probing the 17-byte file can request multi-gigabyte allocation and trigger an OOM kill, without confidentiality or integrity impact.

CVSS severity7.1
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in FFmpeg 8.1.2 and earlier allows remote attackers to exhaust process memory through a crafted IAMF file. The IAMF demuxer's mix_presentation_obu() allocates a language-label array from count_label before checking that the OBU contains matching data. Parsing or probing the 17-byte file can request multi-gigabyte allocation and trigger an OOM kill, without confidentiality or integrity impact.

The record

CVE
CVE-2026-66037
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=0 <=8.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FFmpeg · FFmpegversion=0 <=8.1.2

Published CVSS scores

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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