VM images built with Kubernetes Image Builder Nutanix or OVA providers use default credentials for Windows images if user did not override
Published Aug 17, 2025
7.5
HIGHCVSS 3.1
EPSS 0.36%
Description
A security issue was discovered in the Kubernetes Image Builder where default credentials are enabled during the Windows image build process when using the Nutanix or VMware OVA providers. These credentials, which allow root access, are disabled at the conclusion of the build. Kubernetes clusters are only affected if their nodes use VM images created via the Image Builder project and the vulnerability was exploited during the build process, which requires an attacker to access the build VM and modify the image while the build is in progress.
Affected products
-
- Version 0StatusaffectedConstraints<=0.1.44
- Version 0.1.45StatusunaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kubernetes | Image Builder | unaffected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Rebuild any affected images using a fixed version of Image Builder. Re-deploy the fixed images to any affected VMs.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Aug 18, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
2025-2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.36% (0.00361) | 27.62th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.34% (0.00336) | 25.20th | v5 (v2026.06.15) |
| Aug 18, 2025 | 0.04% (0.00038) | 9.89th | v4 (v2025.03.14) |
References (3)
- http://www.openwall.com/lists/oss-security/2025/07/22/1
- https://github.com/kubernetes/kubernetes/issues/133115 issue-tracking
- https://groups.google.com/g/kubernetes-security-announce/c/tuEsLUQu_PA mailing-list
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2025/07/22/1 | ||
| https://github.com/kubernetes/kubernetes/issues/133115 | issue-tracking | |
| https://groups.google.com/g/kubernetes-security-announce/c/tuEsLUQu_PA | mailing-list |
Change history (0)
No recorded changes yet.