CVE-2026-83551

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

8.5 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

0.80%Up 0.4 points since Sep 2, 2026

What each source reports

CVE List Score used 8.5

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

Record: CVE-2026-83551
CVSS 4.0: 8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-312
Updated: 2026-11-02

EUVDEUVD-2026-69418 8.5

Record: EUVD-2026-69418
CVSS 4.0: 8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
Updated: 2026-11-02

NVD 8.5

Record: CVE-2026-83551
CVSS 4.0: 8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-312
Updated: 2026-11-02

OSV 8.5

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

Record: CVE-2026-83551
CVSS 4.0: 8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
Weakness: CWE-312
Updated: 2026-11-02

Affected products

aws sagemaker-python-sdk

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-83551 is a high vulnerability (CVSS 8.5) in Aws Sagemaker-python-sdk, published September 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.80%, the 56th percentile. No source names a fixed version.