CVE-2026-39884 Detail
Received
This CVE record has recently been published to the CVE List and has been included within the NVD dataset. Descriptionmcp-server-kubernetes is a Model Context Protocol server for Kubernetes cluster management. Versions 3.4.0 and prior contain an argument injection vulnerability in the port_forward tool in src/tools/port_forward.ts, where a kubectl command is constructed via string concatenation with user-controlled input and then naively split on spaces before being passed to spawn(). Unlike all other tools in the codebase which correctly use array-based argument passing with execFileSync(), port_forward treats every space in user-controlled fields (namespace, resourceType, resourceName, localPort, targetPort) as an argument boundary, allowing an attacker to inject arbitrary kubectl flags. This enables exposure of internal Kubernetes services to the network by injecting --address=0.0.0.0, cross-namespace targeting by injecting additional -n flags, and indirect exploitation via prompt injection against AI agents connected to the MCP server. This issue has been fixed in version 3.5.0. Metrics
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Weakness Enumeration
Quick InfoCVE Dictionary Entry:CVE-2026-39884 NVD Published Date: 04/15/2026 NVD Last Modified: 04/15/2026 Source: GitHub, Inc. |
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