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CVE-2026-119116— Use-after-free in the SetClient command handler of kmstool-enclave in AWS aws-nitro-enclaves-sdk-c

Quick assessment

Affected
AWS kmstool-enclave
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 AWS aws-nitro-enclaves-sdk-c 0.4.6 之前的版本中，kmstool-enclave 示例应用程序的 SetClient 命令处理程序存在释放后使用（use-after-free）和重复释放（double-free）漏洞。该漏洞可能允许运行在父 EC2 实例上的应用程序破坏 Nitro Enclave 内部的堆内存，进而导致在 Enclave 内执行任意代码。 为修复此问题，用户应针对 aws-nitro-enclaves-sdk-c 0.4.6 版本，重新构建任何包含 kmsto

CVSS 7.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS kmstool-enclave < 0.4.6 affected
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I. Basic Information for CVE-2026-119116

Vulnerability Information
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Vulnerability Title
Use-after-free in the SetClient command handler of kmstool-enclave in AWS aws-nitro-enclaves-sdk-c
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS kmstool-enclave 0 ~ 0.4.6 -

II. Public POCs for CVE-2026-119116

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III. Intelligence Information for CVE-2026-119116

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Vendor Advisories for CVE-2026-119116 (1)

Other References for CVE-2026-119116 (2)

Same Patch Batch · AWS · 2026-10-30 · 3 CVEs total

CVE-2026-119148 6.5 MEDIUM Unvalidated parent-supplied AWS Region in AWS aws-nitro-enclaves-sdk-c allows impersonatio
CVE-2026-119117 6.5 MEDIUM Insertion of sensitive information into a log file and process argument list in the Amazon

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-416