CVE-2026-77236CWE-787

CVE-2026-77236

High · published August 21, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
5.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
CVSS v4.0
8.3 · CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:H/SA:H
EPSS
0.00162 · 5.0th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-08-21T22:16Z
Affected products (1)
ProductVersionsFixed in
amazon/freertos≥ 10.2.0, < 11.3.111.3.1
References (3)
https://aws.amazon.com/security/security-bulletins/2026-086-aws/ · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1 · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-vq2f-9qj3-jj2m · ff89ba41-3aa1-4d27-914a-91399e9639e5
EPSS history
Timeline
  • 21 AUG 17:47Z
    Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel
    cvelistv5