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CVE-2026-75147— FFmpeg Out-of-Bounds Read in AV1 RTP Packetizer via rtpenc_av1.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 存在缓冲区错误漏洞，该漏洞源于AV1 RTP打包器（libavformat/rtpenc_av1.c）中的关键帧检测循环未先将OBU大小与剩余数据比较，导致剩余大小计数器回绕，造成越界读取。

CVSS 7.1 · High EPSS 0.12% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg < 983dae9c19f46c87d597598c0fd2f2fcee0ad2f8 affected
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I. Basic Information for CVE-2026-75147

Vulnerability Information
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Vulnerability Title
FFmpeg Out-of-Bounds Read in AV1 RTP Packetizer via rtpenc_av1.c
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg before commit 983dae9 contains an out-of-bounds read in the AV1 RTP packetizer (libavformat/rtpenc_av1.c). The keyframe detection loop that searches for a sequence header OBU advanced its pointer and remaining-size counter by the encoded header length plus the OBU payload size without first bounding the OBU size against the remaining data. A crafted OBU size causes the remaining-size counter to wrap to a positive value, causing the next loop iteration to dereference a pointer beyond the end of the packet buffer. A crafted AV1 input packet muxed to RTP triggers the out-of-bounds read.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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 存在缓冲区错误漏洞，该漏洞源于AV1 RTP打包器（libavformat/rtpenc_av1.c）中的关键帧检测循环未先将OBU大小与剩余数据比较，导致剩余大小计数器回绕，造成越界读取。
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 ~ 983dae9c19f46c87d597598c0fd2f2fcee0ad2f8 -

II. Public POCs for CVE-2026-75147

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III. Intelligence Information for CVE-2026-75147

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Patches & Fixes for CVE-2026-75147 (2)

Vendor Advisories for CVE-2026-75147 (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-2026-75141 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-2026-75145 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-125

V. Comments for CVE-2026-75147

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