---
id: CVE-2026-77236
title: "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 …"
summary: "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 …"
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H'
cwe:
  - CWE-787
vendor: amazon
product: freertos
affected:
  - 'freertos >= 10.2.0, < 11.3.1'
patched:
  - freertos 11.3.1
published: '2026-08-21'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T19:10:00.297'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77236'
references:
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-086-aws/'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: 'https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: >-
      https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-vq2f-9qj3-jj2m
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
tags:
  - nvd
epss: 0.00162
epssPercentile: 0.04881
ingestedAt: '2026-10-14T19:49:57.565Z'
---

## Overview

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

- `freertos >= 10.2.0, < 11.3.1`

## Remediation

Upgrade past the affected range:

- `freertos 11.3.1`