CVE-2026-39884

Published: Apr 15, 2026 Last Modified: Apr 15, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 8,3
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: low

Description

AI Translation Available

mcp-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.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0005
Percentile
0,1th
Updated

EPSS Score Trend (Last 2 Days)

88

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Integrity Availability Other
Potential Impacts:
Execute Unauthorized Code Or Commands Alter Execution Logic Read Application Data Modify Application Data
Applicable Platforms
Languages: Not Language-Specific, PHP
View CWE Details
https://github.com/Flux159/mcp-server-kubernetes/security/a…
https://github.com/Flux159/mcp-server-kubernetes/security/advisories/GHSA-4xqg-…
https://github.com/Flux159/mcp-server-kubernetes/releases/t…
https://github.com/Flux159/mcp-server-kubernetes/releases/tag/v3.5.0
https://github.com/Flux159/mcp-server-kubernetes/security/a…
https://github.com/Flux159/mcp-server-kubernetes/security/advisories/GHSA-4xqg-…