CVE-2018-1002102: Kubernetes API server follows unvalidated redirects from streaming Kubelet endpoints

Severity: low (CVSS 2.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-12-05 · updated 2026-06-17
Weakness: CWE-601

Description

Improper validation of URL redirection in the Kubernetes API server in versions prior to v1.14.0 allows an attacker-controlled Kubelet to redirect API server requests from streaming endpoints to arbitrary hosts. Impacted API servers will follow the redirect as a GET request with client-certificate credentials for authenticating to the Kubelet.

Affected products

Fedoraproject Fedora: 31
Kubernetes: from 1.10.0 through 1.13.13; 1.14.0-alpha0, 1.14.0-alpha1

References

https://github.com/kubernetes/kubernetes/issues/85867
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q56CULSH7F7BC4NPS67ZS23ZCLL5TIVK/
https://github.com/kubernetes/kubernetes/issues/85867
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q56CULSH7F7BC4NPS67ZS23ZCLL5TIVK/

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