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Vulnerability record · CVE-2019-11253 · published 17 October 2019

CVE-2019-11253: Kubernetes improper input validation vulnerability

Kubernetes · Kubernetes

Improper input validation in the Kubernetes API server in versions v1.0-1.12 and versions prior to v1.13.12, v1.14.8, v1.15.5, and v1.16.2 allows authorized users to send malicious YAML or JSON payloads, causing the API server to consume excessive CPU or memory, potentially crashing and becoming unavailable. Prior to v1.14.0, default RBAC policy authorized anonymous users to submit requests that could trigger this vulnerability. Clusters upgraded from a version prior to v1.14.0 keep the more permissive policy by default for backwards compatibility.

7.5 CVSS 3.1 High EPSS 26% · top 2.1% CWE-20 · Improper input validationCWE-776 · CWE-776
7.5CVSS 3.1 base score, v2 5.0
26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Improper input validation in the Kubernetes API server in versions v1.0-1.12 and versions prior to v1.13.12, v1.14.8, v1.15.5, and v1.16.2 allows authorized users to send malicious YAML or JSON payloads, causing the API server to consume excessive CPU or memory, potentially crashing and becoming unavailable. Prior to v1.14.0, default RBAC policy authorized anonymous users to submit requests that could trigger this vulnerability. Clusters upgraded from a version prior to v1.14.0 keep the more permissive policy by default for backwards compatibility.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2019:3239 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3811 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3905 Third Party Advisory
https://github.com/kubernetes/kubernetes/issues/83253 ExploitIssue TrackingMitigationThird Party Advisory
https://groups.google.com/forum/#%21topic/kubernetes-security-announce/jk8polzSUxs Permissions Required
https://security.netapp.com/advisory/ntap-20191031-0006/ Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3239 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3811 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3905 Third Party Advisory
https://github.com/kubernetes/kubernetes/issues/83253 ExploitIssue TrackingMitigationThird Party Advisory
https://groups.google.com/forum/#%21topic/kubernetes-security-announce/jk8polzSUxs Permissions Required
https://security.netapp.com/advisory/ntap-20191031-0006/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-11253), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.