CVE-2026-8596

HIGH 7.2

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

CVSS Score

7.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-312
Vendor	amazon sagemaker python sdk
Product	aws
Published	May 14, 2026
Last Updated	May 14, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Amazon SageMaker Python SDK / AWS

2.199.0 ≤ 2.257.1 3.0.0 ≤ 3.7.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2 github.com: https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0 aws.amazon.com: https://aws.amazon.com/security/security-bulletins/2026-031-aws/ github.com: https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5