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CVE-2026-8686— DoS from MQTT v5.0 Deserialization Fault in core MQTT

CVSS 7.5 · High EPSS 0.03% · P8

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProductVersion RangeStatus
FreeRTOScoreMQTT5.0.0affected
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I. Basic Information for CVE-2026-8686

Vulnerability Information
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Vulnerability Title
DoS from MQTT v5.0 Deserialization Fault in core MQTT
Source: NVD (National Vulnerability Database)
Vulnerability Description
Missing bounds validation in the MQTT v5.0 property parser in coreMQTT before 5.0.1 allows an MQTT broker to cause a denial of service by sending a crafted packet. To remediate this issue, users should upgrade to v5.0.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
coreMQTT Client Library 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
coreMQTT Client Library是FreeRTOS开源的一个轻量级客户端通信库。 coreMQTT Client Library 5.0.1之前版本存在缓冲区错误漏洞，该漏洞源于MQTT v5.0属性解析器中缺少边界验证，可能导致MQTT代理通过发送特制数据包造成拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
FreeRTOScoreMQTT 5.0.0 -

II. Public POCs for CVE-2026-8686

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 11290 chars
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III. Intelligence Information for CVE-2026-8686

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Vendor · 1Advisory · 2

IV. Related Vulnerabilities

Same vendor: FreeRTOS
Same weakness: CWE-125

V. Comments for CVE-2026-8686

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