Improper input validation in Kubernetes
CVE-2025-4563
A vulnerability exists in the NodeRestriction admission controller where nodes can bypass dynamic resource allocation authorization checks. When the DynamicResourceAllocation feature gate is enabled, the controller properly validates resource claim statuses during pod status updates but fails to perform equivalent validation during pod creation. This allows a compromised node to create mirror pods that access unauthorized dynamic resources, potentially leading to privilege escalation.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.006 (46.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Kubernetes — versions v1.32.0 - v1.32.5, v1.33.0 - v1.33.1
Weakness classification (CWE)
References
- jordan@liggitt.net (mailing-list)
- jordan@liggitt.net (issue-tracking)
Frequently asked questions
- What is CVE-2025-4563?
- CVE-2025-4563 is a low-severity vulnerability in Kubernetes, classified under Improper Input Validation. CVSS score: 2.7/10. Published 2025-06-23.
- How severe is CVE-2025-4563?
- Low severity. CVSS v3 base score is 2.7 out of 10.