CVE-2026-115413 - AWS API MCP Server OAuth token audience validation bypass
CVE-2026-115413
Summary
Bulletin ID: 2026-004-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/02/02 14:30 PM PST Description: CVE-2026-1777 - Exposed HMAC in SageMaker Python SDK SageMaker Python SDK’s remote functions feature uses a per‑job HMAC key to protect the integrity of serialized functions, arguments, and results stored in S3.
We identified an issue where the HMAC secret key is stored in environment variables and disclosed via the DescribeTrainingJob API. This allows third parties with DescribeTrainingJob permissions to extract the key, forge cloud-pickled payloads with valid HMACs, and overwrite S3 objects.
CVE-2026-1778 - Insecure TLS Configuration in SageMaker Python SDK SageMaker Python SDK is an open source library for training and deploying machine learning models on Amazon SageMaker. We identified an issue where SSL certificate verification was globally disabled in the Triton Python backend.
This configuration was introduced to work around SSL errors during model downloads from public sources (e.g., TorchVision) and it affected all HTTPS connections when the Triton Python model was imported.
Impacted versions: - HMAC Configuration in SageMaker Python SDK v3 < v3.2.0 - HMAC Configuration in SageMaker Python SDK v2 < v2.256.0 - Insecure TLS Configuration in SageMaker Python SDK v3 < v3.1.1 - Insecure TLS Configuration in SageMaker Python SDK v2 < v2.256.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.
Products covered
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Remediation
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CVEs in this advisory 2
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