CVE-2026-8596 Details
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.
A vulnerability exists in the Amazon SageMaker Python SDK ModelBuilder/Serve component, specifically in versions 2.199.0 through 2.257.1 and 3.0.0 through 3.7.1. This vulnerability involves the cleartext storage of the HMAC signing key in the SAGEMAKER_SERVE_SECRET_KEY environment variable. The key is exposed through SageMaker describe APIs, allowing a remote authenticated actor with the right permissions to extract it. With this key, an attacker could forge integrity signatures for manipulated model artifacts, potentially leading to unauthorized code execution in inference containers.
Users are advised to upgrade to Amazon SageMaker Python SDK versions 2.257.2 or 3.8.0. After upgrading, it is recommended to rebuild any models previously created with ModelBuilder using the updated SDK. For models that cannot be immediately upgraded, the SAGEMAKER_SERVE_SECRET_KEY environment variable can be manually removed by recreating the model without this variable in the container environment configuration.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 15, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-312 | Cleartext Storage of Sensitive Information | AMZN |
Affected Products
No affected product data is available for this CVE.
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | AMZN |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 14, 2026 | New CVE Received | AMZN |