---
id: CVE-2026-119116
title: >-
  Use-after-free in the SetClient command handler of kmstool-enclave in AWS
  aws-nitro-enclaves-sdk-c
summary: >-
  A use-after-free and double-free issue in the SetClient command handler of the
  kmstool-enclave sample application of AWS aws-nitro-enclaves-sdk-c before
  0.4.6 may allow an application that runs on the parent EC2 instance to corrupt
  heap …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-416
  - CWE-415
vendor: AWS
product: kmstool-enclave
affected:
  - kmstool-enclave < 0.4.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-30T19:21:57.096116Z'
published: '2026-10-30'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T20:00:57.890Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-119116'
references:
  - url: 'https://github.com/aws/aws-nitro-enclaves-sdk-c/releases/tag/v0.4.6'
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-157-aws/'
  - url: >-
      https://github.com/aws/aws-nitro-enclaves-sdk-c/security/advisories/GHSA-cfhm-qfw4-j7qq
tags:
  - cve.org
epss: 0.00161
epssPercentile: 0.05282
ingestedAt: '2026-11-05T16:24:31.437Z'
---

## Overview

A use-after-free and double-free issue in the SetClient command handler of the kmstool-enclave sample application of AWS aws-nitro-enclaves-sdk-c before 0.4.6 may allow an application that runs on the parent EC2 instance to corrupt heap memory inside a Nitro Enclave which may lead to arbitrary code execution within the enclave.



To remediate this issue, users should rebuild any enclave image that includes kmstool-enclave, or code derived from it, against aws-nitro-enclaves-sdk-c 0.4.6.

## Affected

- `kmstool-enclave < 0.4.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.