CVE-2026-8686 | THREATINT

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 Reserved 2026-05-15 | Published 2026-05-15 | Updated 2026-05-15 | Assigner AMZN

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

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-125 Out-of-bounds read

Product status

Default status

unaffected

5.0.0 (custom)

affected

Credits

Epsilon finder

References

github.com/FreeRTOS/coreMQTT/releases/tag/v5.0.1 patch

aws.amazon.com/security/security-bulletins/2026-032-aws/ vendor-advisory

github.com/...reMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc third-party-advisory

cve.org (CVE-2026-8686)

nvd.nist.gov (CVE-2026-8686)

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