CVE-2026-77236

Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel

Published Aug 21, 2026 CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Amazon
Amazon freertos
CPEs cpe:2.3:o:amazon:freertos:*:*:*:*:*:*:*:*
Vendors & Products Amazon
Amazon freertos
Type Values Removed Values Added
Metrics cvssV4_0

{'score': 8.3, 'vector': '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'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H'}

Type Values Removed Values Added
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.
Title Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel
First Time appeared Freertos
Freertos freertos-kernel
Weaknesses CWE-787
CPEs cpe:2.3:a:freertos:freertos-kernel:*:*:*:*:*:*:*:*
Vendors & Products Freertos
Freertos freertos-kernel
References
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H'}

cvssV4_0

{'score': 8.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Aug 21, 2026, 8:15 PM
Reserved
Aug 20, 2026, 6:42 PM
Status
Analyzed
Published
Aug 21, 2026, 6:16 PM
Modified
Oct 14, 2026, 7:10 PM