Description
As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane.
Metrics
CVSS 3.1 3.1/10
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Kubernetes | Kubernetes | < * |
References
- https://github.com/kubernetes/kubernetes/issues/101493Issue Tracking, Mitigation, Third Party Advisory
- https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOYMailing List, Third Party Advisory
- https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/
- https://security.netapp.com/advisory/ntap-20220225-0002/Third Party Advisory
- https://github.com/kubernetes/kubernetes/issues/101493Issue Tracking, Mitigation, Third Party Advisory
- https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOYMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220225-0002/Third Party Advisory
Timeline
- Published
- Feb 1, 2022
- Last modified
- Jun 17, 2026
- NVD status
- Modified