XML Entity Expansion and Improper Input Validation in Kubernetes API server

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Affected scope and exposure questions

The current feed maps k8s.io/kubernetes (go), k8s.io/kubernetes (go), k8s.io/kubernetes (go), k8s.io/kubernetes (go). Check affected ranges and fixed versions before updating.

Recommended response

1. 1Check inventory. Check lockfiles and deployed manifests for k8s.io/kubernetes, k8s.io/kubernetes, k8s.io/kubernetes.
2. 2Review the reported fix. Update k8s.io/kubernetes to 1.13.12; k8s.io/kubernetes to 1.14.8; k8s.io/kubernetes to 1.15.5; k8s.io/kubernetes to 1.16.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

1. Published upstream

   May 18, 2021

   Evidence: source:osv:source_dates:source-dates:record

2. Source modified

   Sep 10, 2026

   Evidence: source:osv:source_dates:source-dates:record

3. First seen by HOL

   Sep 10, 2026

Sources and claim methodology

• Source referenceaccess.redhat.com
• Source referenceaccess.redhat.com
• Source referenceaccess.redhat.com
• GitHub security advisorygist.github.com
• GitHub security advisorygithub.com
• GitHub security advisorygithub.com
• Source referencegroups.google.com
• NVD vulnerability recordnvd.nist.gov
• Source referencepkg.go.dev
• Source referencesecurity.netapp.com