CVE-2026-8596

Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path

Published May 14, 2026 CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
Description
Cleartext storage of sensitive information in the ModelBuilder/Serve component in Amazon SageMaker Python SDK before v2.257.2 and v3 before v3.8.0 might allow a remote authenticated actor to extract the HMAC signing key from SageMaker API responses and forge valid integrity signatures for specially crafted model artifacts, achieving code execution in inference containers. This issue requires a remote authenticated actor with permissions to call SageMaker describe APIs and S3 write access to the model artifact path.



To remediate this issue, we recommend upgrading to Amazon SageMaker Python SDK v2.257.2 or v3.8.0 and rebuild any models previously created with ModelBuilder using the updated SDK.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-7hh5-prp2-mfh5 Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path
History
Type Values Removed Values Added
First Time appeared Aws
Aws amazon Sagemaker Python Sdk
CPEs cpe:2.3:a:amazon_sagemaker_python_sdk:aws:*:*:*:*:*:*:*:* cpe:2.3:a:aws:amazon_sagemaker_python_sdk:*:*:*:*:*:*:*:*
Vendors & Products Amazon Sagemaker Python Sdk
Amazon Sagemaker Python Sdk aws
Aws
Aws amazon Sagemaker Python Sdk
Type Values Removed Values Added
First Time appeared Amazon
Amazon sagemaker Python Sdk
Vendors & Products Amazon
Amazon sagemaker Python Sdk
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Description Cleartext storage of sensitive information in the ModelBuilder/Serve component in Amazon SageMaker Python SDK before v2.257.2 and v3 before v3.8.0 might allow a remote authenticated actor to extract the HMAC signing key from SageMaker API responses and forge valid integrity signatures for specially crafted model artifacts, achieving code execution in inference containers. This issue requires a remote authenticated actor with permissions to call SageMaker describe APIs and S3 write access to the model artifact path. To remediate this issue, we recommend upgrading to Amazon SageMaker Python SDK v2.257.2 or v3.8.0 and rebuild any models previously created with ModelBuilder using the updated SDK.
Title Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path
First Time appeared Amazon Sagemaker Python Sdk
Amazon Sagemaker Python Sdk aws
Weaknesses CWE-312
CPEs cpe:2.3:a:amazon_sagemaker_python_sdk:aws:*:*:*:*:*:*:*:*
Vendors & Products Amazon Sagemaker Python Sdk
Amazon Sagemaker Python Sdk aws
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Oct 20, 2026, 6:20 PM
Reserved
May 14, 2026, 1:39 PM
Status
Awaiting Analysis
Published
May 14, 2026, 8:17 PM
Modified
Oct 26, 2026, 2:10 PM