CVE-2026-83551: CWE-312 Cleartext storage of sensitive information in AWS sagemaker-python-sdk
Description
Cleartext storage of sensitive information in the @step and @remote decorator pipeline component in Amazon SageMaker Python SDK before v3.11.0 and v2.256.0 might allow an authenticated remote user to extract the HMAC signing key from SageMaker DescribePipeline API responses and forge valid integrity signatures for specially crafted function payloads, achieving code execution in another user's pipeline execution context within the same AWS account.
CVSS v3.1
Score 7.2high
Affected software
AWS
sagemaker-python-sdk
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-83551) affects the Amazon SageMaker Python SDK prior to versions 3.11.0 and 2.256.0. The issue arises from cleartext storage of sensitive information related to the HMAC signing key in pipeline components using the @step and @remote decorators. An authenticated remote attacker with access to the DescribePipeline API can extract this key and forge integrity signatures for malicious function payloads. This enables code execution in the context of another user's pipeline within the same AWS account, potentially leading to unauthorized actions and data compromise.
Potential Impact
An authenticated remote user can extract the HMAC signing key from API responses and use it to forge valid signatures, allowing them to execute arbitrary code in another user's pipeline execution context within the same AWS account. This compromises confidentiality, integrity, and availability of the affected SageMaker pipelines.
Mitigation Recommendations
AWS manages remediation for this cloud-hosted service. A fix is available in versions 3.11.0 and 2.256.0 of the SageMaker Python SDK. Users should upgrade to these versions or later to mitigate the vulnerability. Refer to the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-093-aws/ for official guidance and updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-08-31T18:27:06.063Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-093-aws/","vendor":"AWS"}]
Threat ID: 6a9717f4acd9273b490b16a6
Added to database: 09/01/2026, 18:22:44 UTC
Last enriched: 09/07/2026, 14:22:18 UTC
Last updated: 10/15/2026, 18:48:24 UTC
Views: 99
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