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CVE-2026-75146— FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.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 65b0dab之前版本存在缓冲区错误漏洞，该漏洞源于DASH demuxer（libavformat/dashdec.c）在处理实时DASH清单刷新时未正确检查fragments数组索引的下界，允许负索引越界读取，恶意或配置错误的DASH服务器利用递减的startNumber可触发该漏洞。

CVSS 8.1 · High EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg < 65b0dab903e5975e036b30ecc58f5935d4f151e0 affected
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I. Basic Information for CVE-2026-75146

Vulnerability Information
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Vulnerability Title
FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg before commit 65b0dab contains an out-of-bounds read in the DASH demuxer (libavformat/dashdec.c). When a live DASH manifest is refreshed with a startNumber that is lower than the previous value, the current sequence number is driven negative. The fragment retrieval function checked only the upper bound before indexing the fragments array, allowing a negative index to be used and causing an out-of-bounds read. A malicious or misconfigured DASH server can trigger this by serving a live manifest with a decreasing startNumber across a manifest refresh.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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 65b0dab之前版本存在缓冲区错误漏洞，该漏洞源于DASH demuxer（libavformat/dashdec.c）在处理实时DASH清单刷新时未正确检查fragments数组索引的下界，允许负索引越界读取，恶意或配置错误的DASH服务器利用递减的startNumber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 ~ 65b0dab903e5975e036b30ecc58f5935d4f151e0 -

II. Public POCs for CVE-2026-75146

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III. Intelligence Information for CVE-2026-75146

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Patches & Fixes for CVE-2026-75146 (2)

Vendor Advisories for CVE-2026-75146 (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-2026-75142 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-125

V. Comments for CVE-2026-75146

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