CVE-2026-8596
Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path
- State
- Published
- Severity
- 8.5 High
- Published
- May 14, 2026
- Updated
- Oct 20, 2026
- Reserved
- May 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.5 High | 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 | AMZN |
| 3.1 | 7.2 High | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H | AMZN |
Weaknesses
- CWE-312 Cleartext storage of sensitive information
Affected Products
| Product | Versions |
|---|---|
Amazon SageMaker Python SDKAWS |
|
References
- https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2patch
- https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0patch
- https://aws.amazon.com/security/security-bulletins/2026-031-aws/vendor-advisory
- https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5third-party-advisory
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