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CVE-2026-75141— FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing

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组织开源的一个多媒体处理框架。 FFmpeg acf5d7c之前版本存在缓冲区错误漏洞，该漏洞源于hvcC box写入器在处理HEVC配置记录时，单一类型NAL单元数量超出计数字段可表示范围导致计数溢出，引发堆缓冲区溢出，特制HEVC输入文件可在封装过程中触发该溢出。

CVSS 7.8 · High EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg < acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781 affected
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I. Basic Information for CVE-2026-75141

Vulnerability Information
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Vulnerability Title
FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg before commit acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing a heap buffer overflow. A crafted HEVC input file triggers the overflow during muxing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
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组织开源的一个多媒体处理框架。 FFmpeg acf5d7c之前版本存在缓冲区错误漏洞，该漏洞源于hvcC box写入器在处理HEVC配置记录时，单一类型NAL单元数量超出计数字段可表示范围导致计数溢出，引发堆缓冲区溢出，特制HEVC输入文件可在封装过程中触发该溢出。
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 ~ acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781 -

II. Public POCs for CVE-2026-75141

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III. Intelligence Information for CVE-2026-75141

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Patches & Fixes for CVE-2026-75141 (2)

Vendor Advisories for CVE-2026-75141 (1)

Same Patch Batch · FFmpeg · 2026-08-19 · 7 CVEs total

CVE-2026-75143 9.8 CRITICAL FFmpeg Heap Buffer Overflow via RIST Protocol Reader
CVE-2026-75146 8.1 HIGH FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c
CVE-2026-75142 7.8 HIGH FFmpeg Stack Buffer Overflow in MPEG-PS Muxer via mpegenc.c
CVE-2026-75144 7.8 HIGH FFmpeg Heap Buffer Overflow in VC-2/Dirac RTP Packetizer
CVE-2026-75147 7.1 HIGH FFmpeg Out-of-Bounds Read in AV1 RTP Packetizer via rtpenc_av1.c
CVE-2026-75145 5.8 MEDIUM FFmpeg Integer Narrowing Conversion OOB Memory Access in AV1 RTP Packetizer

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-122

V. Comments for CVE-2026-75141

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