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.
References (3)
Core 3
Core References
Vendor Advisory vendor-advisory
https://aws.amazon.com/security/security-bulletins/2026-032-aws/
Third Party Advisory third-party-advisory
https://github.com/FreeRTOS/coreMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc
Scores
CVSS v3
7.5
EPSS
0.0039
EPSS Percentile
30.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (2)
freertos/coremqtt
5.0.0
FreeRTOS/coreMQTT
5.0.0
Published
May 15, 2026
Tracked Since
May 16, 2026