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Back to active CVEs
High · CVSS 7.3CVE-2026-77236

Missing size validation in SecureContext_AllocateContext in FreeRTOS-KernelCVE-2026-77236

Answer in brief

CVE-2026-77236 records a High severity (CVSS 7.3) vulnerability in Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel. The current sources do not mark it as known exploited. The current feed maps FreeRTOS/FreeRTOS-Kernel (generic), FreeRTOS/FreeRTOS-Kernel (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 21, 2026Updated Aug 25, 2026Source checked Oct 6, 2026First seen by HOL Aug 21, 2026Material review Aug 25, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.3
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreeRTOS/FreeRTOS-Kernel (generic), FreeRTOS/FreeRTOS-Kernel (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:amazon:freertos:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FreeRTOS/FreeRTOS-Kernelgeneric10.2.0Not reported
FreeRTOS/FreeRTOS-Kernelgeneric>=10.2.0 <=11.3.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FreeRTOS/FreeRTOS-Kernel, FreeRTOS/FreeRTOS-Kernel.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 21, 2026

Sources and claim methodology

  • Source referenceaws.amazon.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Oct 6, 2026
References
3 linked sources
Open source record