CVE-2026-1777 Cleartext transmission of sensitive materials in aws/sagemaker-python-sdk
The SDK leaks HMAC signing keys in cleartext, allowing attackers with specific permissions to upload malicious artifacts for execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-1777?
CVE-2026-1777 is a high-severity vulnerability in AWS SageMaker Python SDK, published on 2 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-319
Which versions are affected by CVE-2026-1777?
5 open source packages ship an affected version, including sagemaker.
| Package | Affected | Fixed in |
|---|---|---|
sagemaker PyPI | All versions | 2.256.0, 3.2.0 |
sagemaker PyPI | All versions | 2.256.0 |
sagemaker PyPI | All versions | 2.256.0 |
sagemaker PyPI | From 3.0 | 3.2.0 |
sagemaker PyPI | From 3.0 | 3.2.0 |
How do I fix CVE-2026-1777?
Upgrade sagemaker to a fixed version for your release line: 2.256.0 or 3.2.0.
Is CVE-2026-1777 being exploited?
There is no known exploitation of CVE-2026-1777 in the wild and no public exploit code.
Sources
Also known as GHSA-rjrp-m2jw-pv9c, PYSEC-2026-1888.