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CVE-2026-66039— FFmpeg MACE6 Audio Decoder Heap Out-of-Bounds Write via CAF File

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及之前版本存在安全漏洞，该漏洞源于MACE6音频解码器中的有符号整数溢出，因为处理特制CAF文件时，desc chunk中的超大bytes_per_packet和frames_per_packet值在mace_decode_frame()中触发整数溢出，导致缓冲区分配不足和堆越界写入，可能允许攻击者执行代码。

CVSS 8.8 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg ≤ 8.1.2 affected
aafb5c655edc76a753275c383ebb139feb032718 unaffected
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I. Basic Information for CVE-2026-66039

Vulnerability Information
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Vulnerability Title
FFmpeg MACE6 Audio Decoder Heap Out-of-Bounds Write via CAF File
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file with a malicious bytes_per_packet value. Attackers can craft a CAF file with oversized bytes_per_packet and frames_per_packet values in the desc chunk to trigger an integer overflow in mace_decode_frame() during output sample count computation, resulting in an undersized buffer allocation and heap out-of-bounds write that could enable code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
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及之前版本存在安全漏洞，该漏洞源于MACE6音频解码器中的有符号整数溢出，因为处理特制CAF文件时，desc chunk中的超大bytes_per_packet和frames_per_packet值在mace_decode_frame()中触发整数溢出，导致缓冲区分配不足和堆越界写入，可能允许攻击者执行代码。
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-2026-66039

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III. Intelligence Information for CVE-2026-66039

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Patches & Fixes for CVE-2026-66039 (2)

Vendor Advisories for CVE-2026-66039 (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-2026-66037 6.5 MEDIUM FFmpeg IAMF Demuxer Uncontrolled Resource Consumption via mix_presentation_obu()
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-190

V. Comments for CVE-2026-66039

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