CVE-2026-8596: CWE-312 Cleartext storage of sensitive information in Amazon SageMaker Python SDK AWS
CVE-2026-8596 is a high-severity vulnerability in Amazon SageMaker Python SDK versions before v2.257.2 and v3 before v3.8.0. It involves cleartext storage of the HMAC signing key within the ModelBuilder/Serve component. Authenticated users with permissions to call SageMaker describe APIs and write access to the model artifact path in S3 can extract this key and forge integrity signatures, potentially leading to code execution within inference containers. AWS has released patched versions and recommends upgrading and rebuilding affected models. This vulnerability affects the cloud-hosted AWS SageMaker service.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-8596) affects Amazon SageMaker Python SDK versions prior to v2.257.2 and v3.8.0. The issue is cleartext storage of sensitive information, specifically the HMAC signing key, in the ModelBuilder/Serve component. An authenticated user with specific permissions can extract this key from API responses and use it to forge integrity signatures, which may allow code execution within inference containers. AWS manages the SageMaker service as a cloud service and has released patched SDK versions to address this issue. Users are advised to upgrade the SDK and rebuild models to mitigate the risk.
Potential Impact
The vulnerability allows an authenticated user with certain permissions to obtain the HMAC signing key in cleartext. This can enable forging of integrity signatures, potentially leading to unauthorized code execution within inference containers. The CVSS score of 7.2 reflects high impact on confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
AWS has released patched versions of the Amazon SageMaker Python SDK (v2.257.2 and later, v3.8.0 and later) that address this vulnerability. Users should upgrade to these versions and rebuild affected models to mitigate the risk. Since this is a cloud service, AWS manages remediation on the service side, but client-side SDK upgrades and model rebuilds are required. Refer to the official AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-031-aws/ for detailed guidance.
CVE-2026-8596: CWE-312 Cleartext storage of sensitive information in Amazon SageMaker Python SDK AWS
Description
CVE-2026-8596 is a high-severity vulnerability in Amazon SageMaker Python SDK versions before v2.257.2 and v3 before v3.8.0. It involves cleartext storage of the HMAC signing key within the ModelBuilder/Serve component. Authenticated users with permissions to call SageMaker describe APIs and write access to the model artifact path in S3 can extract this key and forge integrity signatures, potentially leading to code execution within inference containers. AWS has released patched versions and recommends upgrading and rebuilding affected models. This vulnerability affects the cloud-hosted AWS SageMaker service.
CVSS v3.1
Score 7.2high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-8596) affects Amazon SageMaker Python SDK versions prior to v2.257.2 and v3.8.0. The issue is cleartext storage of sensitive information, specifically the HMAC signing key, in the ModelBuilder/Serve component. An authenticated user with specific permissions can extract this key from API responses and use it to forge integrity signatures, which may allow code execution within inference containers. AWS manages the SageMaker service as a cloud service and has released patched SDK versions to address this issue. Users are advised to upgrade the SDK and rebuild models to mitigate the risk.
Potential Impact
The vulnerability allows an authenticated user with certain permissions to obtain the HMAC signing key in cleartext. This can enable forging of integrity signatures, potentially leading to unauthorized code execution within inference containers. The CVSS score of 7.2 reflects high impact on confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
AWS has released patched versions of the Amazon SageMaker Python SDK (v2.257.2 and later, v3.8.0 and later) that address this vulnerability. Users should upgrade to these versions and rebuild affected models to mitigate the risk. Since this is a cloud service, AWS manages remediation on the service side, but client-side SDK upgrades and model rebuilds are required. Refer to the official AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-031-aws/ for detailed guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-05-14T13:39:22.096Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-031-aws/","vendor":"AWS"}]
Threat ID: 6a062b6cec166c07b00def7e
Added to database: 05/14/2026, 20:07:08 UTC
Last enriched: 06/08/2026, 22:16:54 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 117
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