CVE-2026-119116

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

State: Published
Severity: 8.7 High
Published: Oct 30, 2026
Updated: Oct 30, 2026
Reserved: Oct 29, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L	AMZN
3.1	7.8 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H	AMZN

Weaknesses

CWE-416 Use after free
CWE-415 Double free

Affected Products

Product	Versions
kmstool-enclaveAWS	before 0.4.6Affected

References

https://github.com/aws/aws-nitro-enclaves-sdk-c/releases/tag/v0.4.6release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-157-aws/vendor-advisory
https://github.com/aws/aws-nitro-enclaves-sdk-c/security/advisories/GHSA-cfhm-qfw4-j7qqthird-party-advisory

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