CVE-2026-77236

High

Description

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.

SeverityHigh

CVSS7.3

Exploit probability—

ProductAmazon Freertos

PublishedAug 21, 2026

First seenAug 21, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

amazon freertos11.3.1 or later

Patches

github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-086-aws/

Affected products

Product	Affected versions	Fixed in
amazon freertos	10.2.0 ≤ v < 11.3.1	11.3.1

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