Low
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-8562
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:54 UTC · Revision 1
Source evidence
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.
osv:CVE-2020-8562
Complete source record
{
"id": "f9196b9e7affd54fb4a8e3a65ca0e1d8d3ebdd95c0b8a85cd72870e36214af94",
"url": "https://osv.dev/vulnerability/CVE-2020-8562",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-8562",
"summary": "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.",
"evidence": "osv:CVE-2020-8562",
"products": [],
"severity": "low",
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],
"modified": "2026-10-24T10:50:39.769909650Z",
"provider": "osv",
"references": [
"https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY",
"https://security.netapp.com/advisory/ntap-20220225-0002/",
"https://github.com/kubernetes/kubernetes/issues/101493",
"https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-8562",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442429,
"published_at": "2022-02-01T11:15:10.903+00:00"
}