CVE-2026-8686

7.5 HIGH

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...

Published: 2026-05-15 · Last updated: 2026-05-19

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-125

Affected products

Vendor	Product
freertos	coremqtt

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

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-8686
[Vendor advisory]https://aws.amazon.com/security/security-bulletins/2026-032-aws/
[Other]https://github.com/FreeRTOS/coreMQTT/releases/tag/v5.0.1
[Vendor advisory]https://github.com/FreeRTOS/coreMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc

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