TI-2026-57686 Aliases CVE-2026-83551

Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK @step/@remote pipeline path

MEDIUM 40CWE-312Published 2026-09-01 · Updated 2026-09-01

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-312.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00802 56th percentileScored 2026-11-07

Fix Fixed sagemaker-python-sdk (AWS): 3.11.0, 2.256.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
AWS	sagemaker-python-sdk	before 3.11.0; before 2.256.0	3.11.0, 2.256.0	Patch available	CNA

sagemaker-python-sdk VendorAWS Affected before 3.11.0; before 2.256.0 Fixed in 3.11.0, 2.256.0 Patch available CNA

Remediation

Fix · CNA sagemaker-python-sdk (AWS) Fixed in 3.11.0, 2.256.0

Timeline

2026-10-02 Threatist record created from CVE-2026-83551
2026-10-18 EPSS moved to the 50th–90th percentile

References

Patch 2

Advisory 1

https://aws.amazon.com/security/security-bulletins/2026-093-aws/

Other 1

https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-7xmc-crrw-fv5r

TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9

See all 383 →

Sources

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