CVE-2026-77237: Amazon Freertos

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 to read privileged kernel memory. To remediate this issue, users should upgrade to version 11.3.1 or later.

Affected products

• Amazon Freertos: from 7.4.0, before 11.3.1 (fixed in 11.3.1)

Published 2026-08-21. Last modified 2026-08-25.