What’s Vulnerable › Vulnerabilities

CVE-2026-83551: Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK @step/@remote pipeline path

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-09-03
• Weakness: CWE-312

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.

Affected products

• aws sagemaker-python-sdk: before 3.11.0; before 2.256.0 — fixed in 2.256.0, 3.11.0

How to fix

Upgrade to a fixed version: aws sagemaker-python-sdk 2.256.0, 3.11.0. Check the vendor advisory for mitigations.

References

• https://aws.amazon.com/security/security-bulletins/2026-093-aws/
• https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.256.0
• https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.11.0
• https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7xmc-crrw-fv5r

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