Amazon SageMaker SDK v3.11.0/v2.256.0: HMAC Leak @step/@remote
CVE-2026-83551 Published on September 1, 2026
Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK @step/@remote pipeline path
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.
Vulnerability Analysis
CVE-2026-83551 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Cleartext Storage of Sensitive Information
The application stores sensitive information in cleartext within a resource that might be accessible to another control sphere. Because the information is stored in cleartext, attackers could potentially read it. Even if the information is encoded in a way that is not human-readable, certain techniques could determine which encoding is being used, then decode the information.
Products Associated with CVE-2026-83551
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Affected Versions
AWS sagemaker-python-sdk:- Before 3.11.0 is affected.
- Before 2.256.0 is affected.