⚠ Reference material — not professional advice. Test in staging, back up first, verify against your specific version. Use your own judgment for your environment.
● High · CVSS 7.2

How to Fix CVE-2026-1777: Critical Vulnerability in SageMaker Python SDK

Other vulnerabilities in the same area that are worth patching alongside this one:

*By Sai Kiran Pandrala*

⚡ At a glance
SeverityCVSS 7.2 - High
Actively exploited?Not currently listed in CISA KEV
AffectedSageMaker Python SDK before v3.2.0
Fixed in3.2.0, 2.256.0
Type (CWE)CWE-319: Cleartext Transmission of Sensitive Information

What is CVE-2026-1777?

CVE-2026-1777 is a security flaw in SageMaker Python SDK. 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.

Why this CVE matters

Unpatched network-facing software is the leading initial-access vector in public breach reporting. Treat any CVSS-9 class flaw on an internet-reachable system as urgent, regardless of whether public exploit code has been observed yet.

For deployments of SageMaker Python SDK that have been exposed to the public internet during the disclosure window, the operating assumption should be that scanning has already happened. Even where exploitation has not been publicly observed, scanning for the vulnerable fingerprint is cheap and routine. Patching closes the door; log review and credential rotation close out the rest of the response.

Am I affected?

Check your installed SageMaker Python SDK version against the affected ranges in the vendor advisory linked below. If you cannot determine the version, treat the system as potentially affected and apply the patched build.

Open SageMaker Python SDK's About dialog or run the vendor-documented version-check command. Compare the result against the affected ranges in the advisory.

How to fix CVE-2026-1777

  1. Read the vendor advisory in full: https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
  2. Upgrade SageMaker Python SDK to 3.2.0, 2.256.0 or a later version listed in the vendor advisory.
  3. Back up the configuration (and database, where applicable) before upgrading.
  4. Apply the patch in a maintenance window. For HA pairs, upgrade the standby node first, fail over, then upgrade the former primary.
  5. Restart the affected service so the patched binary loads, then verify the new version (see verification section).

npm / Yarn / pnpm


# Confirm the patched build against the vendor advisory: https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
# Update to the patched release 3.2.0.
npm install sagemaker-python-sdk@3.2.0
# Alternative pinning:
npm install sagemaker-python-sdk@latest
npm ls sagemaker-python-sdk

PyPI (pip / Poetry)


# Confirm the patched build against the vendor advisory: https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
pip install --upgrade "sagemaker-python-sdk==3.2.0"
pip show sagemaker-python-sdk | grep -i version

# Poetry equivalent:
poetry add sagemaker-python-sdk@3.2.0

Docker / container


# Confirm the patched build against the vendor advisory: https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
docker pull <your-registry>/sagemaker-python-sdk:3.2.0
docker stop <app> && docker rm <app>
docker run -d --name <app> <your-registry>/sagemaker-python-sdk:3.2.0
docker image inspect <your-registry>/sagemaker-python-sdk:3.2.0 --format '{{.Id}}'

Ubuntu / Debian


# Confirm the patched build against the vendor advisory: https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
sudo apt-get update
sudo apt-get install --only-upgrade python3
dpkg -s python3 | grep -i version
# Target patched version: 3.2.0

RHEL / Rocky / AlmaLinux / Fedora


# Confirm the patched build against the vendor advisory: https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
sudo dnf upgrade --refresh python3 -y
rpm -q python3
# Target patched version: 3.2.0

openSUSE


sudo zypper refresh
sudo zypper update python3

Verify the fix landed


# Confirm the patched build against the vendor advisory: https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
# 1. Confirm the running version equals the advisory's fixed-in build.
#    (Use the platform-specific version probe from the commands above.)

# 2. Re-scan with your vulnerability scanner (Nessus, Qualys, Tenable, OpenVAS).
#    The scanner should no longer flag CVE-2026-1777 on the patched target.

# 3. Inspect recent service and kernel logs for crash-loops or rollback events.
journalctl --since "10 minutes ago" | tail -200
dmesg --since "10 minutes ago" | tail -100

If you cannot patch immediately

No official workaround exists beyond restricting network exposure to the affected component. Apply the vendor patch as the primary remediation.

How to verify the fix worked

If your installation was internet-reachable during the disclosure window, treat log review as part of the remediation rather than an optional follow-up. Look for log entries that do not match your normal request patterns, especially repeated requests to the same uncommon endpoint, and any administrative changes you cannot tie back to a known operator.

Frequently asked questions

Is CVE-2026-1777 being exploited in the wild?

Public exploitation has not been confirmed by CISA at the time of writing. Treat the patch as time-sensitive anyway; reports often lag actual abuse.

Will a WAF or IDS rule fully mitigate CVE-2026-1777?

No. Network-layer filters can reduce noise and slow opportunistic scanners, but they will not stop a determined attacker. The vendor patch is the only durable fix.

How long should I plan for the upgrade?

Typical vendor-documented upgrade windows for SageMaker Python SDK run from a few minutes to under an hour depending on cluster size. Test in a staging environment first and follow the vendor's documented HA upgrade order.

References

*This guide was assembled from the official vendor advisory, the NVD record, and the CISA KEV catalog entry on 2026-05-25. Always confirm against the vendor advisory before applying changes in production.*