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CVE-2026-75143— FFmpeg Heap Buffer Overflow via RIST Protocol Reader

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 1c10bcc之前版本存在缓冲区错误漏洞，该漏洞源于librist_read()函数忽略其size参数，将完整接收的负载长度复制到调用者提供的目标缓冲区，导致堆缓冲区溢出，远程RIST发送者可通过发送超过调用者缓冲区大小的数据包触发该漏洞。

CVSS 9.8 · Critical EPSS 0.40% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg < 1c10bcc2e17255dacb717a25ab3db142ce390602 affected
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I. Basic Information for CVE-2026-75143

Vulnerability Information
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Vulnerability Title
FFmpeg Heap Buffer Overflow via RIST Protocol Reader
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination size. This is reachable via the async:rist:// URL scheme, where the async wrapper supplies a smaller buffer than the received payload. A remote RIST sender can trigger the overflow by sending a packet whose payload exceeds the caller buffer size.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 1c10bcc之前版本存在缓冲区错误漏洞，该漏洞源于librist_read()函数忽略其size参数，将完整接收的负载长度复制到调用者提供的目标缓冲区，导致堆缓冲区溢出，远程RIST发送者可通过发送超过调用者缓冲区大小的数据包触发该漏洞。
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 ~ 1c10bcc2e17255dacb717a25ab3db142ce390602 -

II. Public POCs for CVE-2026-75143

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III. Intelligence Information for CVE-2026-75143

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Patches & Fixes for CVE-2026-75143 (2)

Vendor Advisories for CVE-2026-75143 (1)

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

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-2026-75141 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-122

V. Comments for CVE-2026-75143

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