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CVE-2026-75142— FFmpeg Stack Buffer Overflow in MPEG-PS Muxer via mpegenc.c

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 9d786e4之前版本存在缓冲区错误漏洞，该漏洞源于MPEG-PS muxer（libavformat/mpegenc.c）在处理输入流时，当输入流数量超过固定大小栈缓冲区容量时发生栈缓冲区溢出，特制输入可触发该漏洞。

CVSS 7.8 · High EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg < 9d786e4b5e9b8482651928574de33772aeee7be1 affected
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I. Basic Information for CVE-2026-75142

Vulnerability Information
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Vulnerability Title
FFmpeg Stack Buffer Overflow in MPEG-PS Muxer via mpegenc.c
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg before commit 9d786e4 contains a stack buffer overflow in the MPEG-PS muxer (libavformat/mpegenc.c). When muxing input with more streams than the muxer's fixed-size stack buffer accommodates, the buffer is overflowed. A crafted input with an excessive number of streams triggers the overflow during MPEG-PS 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
栈缓冲区溢出
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 9d786e4之前版本存在缓冲区错误漏洞，该漏洞源于MPEG-PS muxer（libavformat/mpegenc.c）在处理输入流时，当输入流数量超过固定大小栈缓冲区容量时发生栈缓冲区溢出，特制输入可触发该漏洞。
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 ~ 9d786e4b5e9b8482651928574de33772aeee7be1 -

II. Public POCs for CVE-2026-75142

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III. Intelligence Information for CVE-2026-75142

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Patches & Fixes for CVE-2026-75142 (2)

Other References for CVE-2026-75142 (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-2026-75141 7.8 HIGH FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing
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-121

V. Comments for CVE-2026-75142

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