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.
Published: 2026-05-15
Score: 8.7 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 15 May 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 15 May 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title DoS from MQTT v5.0 Deserialization Fault in core MQTT
First Time appeared Freertos
Freertos coremqtt
Weaknesses CWE-125
CPEs cpe:2.3:a:freertos:coremqtt:5.0.0:*:*:*:*:*:*:*
Vendors & Products Freertos
Freertos coremqtt
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Freertos Coremqtt
cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-05-15T20:22:58.148Z

Reserved: 2026-05-15T14:25:50.894Z

Link: CVE-2026-8686

cve-icon Vulnrichment

Updated: 2026-05-15T20:22:54.887Z

cve-icon NVD

Status : Received

Published: 2026-05-15T19:17:05.057

Modified: 2026-05-15T19:17:05.057

Link: CVE-2026-8686

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-15T22:30:06Z

Weaknesses