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CVE-2026-66037— FFmpeg IAMF Demuxer Uncontrolled Resource Consumption via mix_presentation_obu()

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组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 8.1.2及之前版本存在资源管理错误漏洞，该漏洞源于IAMF demuxer中不受控制的资源消耗，mix_presentation_obu函数在libavformat/iamf_parse.c中调用av_calloc时使用攻击者控制的count_label值，在验证可用OBU数据前导致分配放大，可能使进程内存耗尽或触发OOM-kill。

CVSS 6.5 · Medium EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg ≤ 8.1.2 affected
86708357d126af84c16f80d9c57335d1e8c845c5 unaffected
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I. Basic Information for CVE-2026-66037

Vulnerability Information
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Vulnerability Title
FFmpeg IAMF Demuxer Uncontrolled Resource Consumption via mix_presentation_obu()
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg through 8.1.2, fixed in commit 5d7112c, contains an uncontrolled resource consumption vulnerability in the IAMF demuxer that allows an unauthenticated attacker to cause multi-gigabyte memory allocation from a 17-byte input file by supplying a crafted count_label field. The mix_presentation_obu() function in libavformat/iamf_parse.c calls av_calloc(count_label, sizeof(*language_label)) with an attacker-controlled value before validating available OBU data, enabling an allocation amplification of approximately 126 million bytes per input byte that exhausts process memory or triggers an OOM-kill during format probing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 资源管理错误漏洞
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及之前版本存在资源管理错误漏洞，该漏洞源于IAMF demuxer中不受控制的资源消耗，mix_presentation_obu函数在libavformat/iamf_parse.c中调用av_calloc时使用攻击者控制的count_label值，在验证可用OBU数据前导致分配放大，可能使进程内存耗尽或触发OOM-kill。
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-2026-66037

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III. Intelligence Information for CVE-2026-66037

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Patches & Fixes for CVE-2026-66037 (2)

Vendor Advisories for CVE-2026-66037 (1)

Same Patch Batch · FFmpeg · 2026-07-24 · 6 CVEs total

CVE-2026-66036 8.8 HIGH FFmpeg Heap Out-of-Bounds Write in vf_hqdn3d Filter
CVE-2026-66040 8.8 HIGH FFmpeg Heap Out-of-Bounds Write via PNG/APNG eXIf Encoder
CVE-2026-66041 8.8 HIGH FFmpeg 7.0 - 8.1.2 Heap Out-of-Bounds Write via vf_quirc Filter
CVE-2026-66039 8.8 HIGH FFmpeg MACE6 Audio Decoder Heap Out-of-Bounds Write via CAF File
CVE-2026-66038 6.5 MEDIUM FFmpeg LCL/ZLIB Video Decoder Information Disclosure via lcldec.c

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-770

V. Comments for CVE-2026-66037

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