CVE-2019-11253

Kubernetes API Server JSON/YAML parsing vulnerable to resource exhaustion attack

Published Oct 17, 2019 CVSS 3.1 · 7.5 High EPSS 25.9% KEV · Not listed
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.

Remediation

Vendor Workaround

Exposure to requests from unauthenticated users can be mitigated by removing all write permissions from unauthenticated users, following instructions at https://github.com/kubernetes/kubernetes/issues/83253

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-pmqp-h87c-mr78 XML Entity Expansion and Improper Input Validation in Kubernetes API server
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
kubernetes
Published
Updated
Sep 16, 2024, 11:21 PM
Reserved
Apr 17, 2019, 12:00 AM
Status
Analyzed
Published
Oct 17, 2019, 4:15 PM
Modified
Jun 17, 2026, 2:12 AM
Severity
Important
Public date
Sep 28, 2019, 12:00 AM