CVE-2026-77236: Amazon Freertos

High severity, CVSS 7.3. EPSS: 0.2% chance of exploitation in the next 30 days.

Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.

Affected products

• Amazon Freertos: from 10.2.0, before 11.3.1 (fixed in 11.3.1)

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