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CVE-2026-66041— FFmpeg 7.0 - 8.1.2 Heap Out-of-Bounds Write via vf_quirc Filter

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 7.0版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于vf_quirc过滤器存在堆越界写入问题，由于提供的特制PGS/SUP字幕文件帧尺寸不匹配，导致av_image_copy_plane()复制数据超出初始分配大小，从而造成堆损坏和进程崩溃，可能执行任意代码。

CVSS 8.8 · High EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg 7.0≤ 8.1.2 affected
4da9812e25894fb51d62a8875cfa8eb39b5e20f5 unaffected
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I. Basic Information for CVE-2026-66041

Vulnerability Information
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Vulnerability Title
FFmpeg 7.0 - 8.1.2 Heap Out-of-Bounds Write via vf_quirc Filter
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg 7.0 through 8.1.2, fixed in commit 4da9812, contains a heap out-of-bounds write vulnerability in the vf_quirc filter that allows an attacker to corrupt heap memory by supplying a crafted PGS/SUP subtitle file with mismatched frame dimensions. Attackers can provide a subtitle file whose second presentation has larger dimensions than its first, causing av_image_copy_plane() to copy data exceeding the initial allocation size into the undersized libquirc grayscale image buffer, resulting in heap corruption and process crash with potential for 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
跨界内存写
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 7.0版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于vf_quirc过滤器存在堆越界写入问题，由于提供的特制PGS/SUP字幕文件帧尺寸不匹配，导致av_image_copy_plane()复制数据超出初始分配大小，从而造成堆损坏和进程崩溃，可能执行任意代码。
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 7.0 ~ 8.1.2 -

II. Public POCs for CVE-2026-66041

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III. Intelligence Information for CVE-2026-66041

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Patches & Fixes for CVE-2026-66041 (2)

Vendor Advisories for CVE-2026-66041 (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-2026-66039 8.8 HIGH FFmpeg MACE6 Audio Decoder Heap Out-of-Bounds Write via CAF File
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-787

V. Comments for CVE-2026-66041

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