High 7.2Published May 14, 2026

CVE-2026-8596Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path

Updated under an hour ago (Oct 26, 2026, 11:30 AM ET)

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It affects AWS Amazon SageMaker Python SDK. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for AWS Amazon SageMaker Python SDK

Exploited in the last 30 days

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.

CVSS: 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-312
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Oct 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS Amazon SageMaker Python SDK aws:amazon_sagemaker_python_sdk (from the name)	from 2.199.0 through 2.257.1; from 3.0.0 through 3.7.1	CNA record

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.