CVE-2026-1777
CVE-2026-1777 is a high-severity vulnerability with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-319.
Key facts
- Severity: High (CVSS 3.x base score 7.2)
- CVSS v4: 8.5
- EPSS exploit prediction: 0% (36th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-5264
- Weakness: CWE-319
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-1777?
- 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.
- How severe is CVE-2026-1777?
- CVE-2026-1777 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-1777 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-1777?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-1777 have an EU (EUVD) identifier?
- Yes. CVE-2026-1777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5264.
- When was CVE-2026-1777 published?
- CVE-2026-1777 was published on 2026-02-02 and last updated on 2026-06-17.
References
- https://aws.amazon.com/security/security-bulletins/2026-004-AWS/
- https://github.com/aws/sagemaker-python-sdk/releases/tag/v2.256.0
- https://github.com/aws/sagemaker-python-sdk/releases/tag/v3.2.0
- https://github.com/aws/sagemaker-python-sdk/security/advisories/GHSA-rjrp-m2jw-pv9c
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