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

> CVE-2026-8596: Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path. CVSS 7.2 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-8596
Last updated: 2026-10-20T19:19:23Z

- Published: 2026-05-14 19:35 UTC · Updated: 2026-10-20 19:19 UTC · Assigner: AMZN
- CVSS: 7.2 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.61%, 49th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-312

## 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.

## Affected vendors and products

- AWS: Amazon SageMaker Python SDK

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-8596)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-8596)
- [https://aws.amazon.com/security/security-bulletins/2026-031-aws/](https://aws.amazon.com/security/security-bulletins/2026-031-aws/)
- [https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2](https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.257.2)
- [https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0](https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.8.0)
- [https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5](https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7hh5-prp2-mfh5)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-8596 · Markdown: https://rewindex.com/cve/CVE-2026-8596.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-8596 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:46:03.897Z