CVE-2026-5602 Overview
A command injection vulnerability has been identified in Nor2-io heim-mcp versions up to 0.1.3. The vulnerability exists in the registerTools function within the src/tools.ts file, specifically affecting the new_heim_application/deploy_heim_application/deploy_heim_application_to_cloud component. This flaw allows attackers with local access to inject and execute arbitrary operating system commands through improper input handling.
Critical Impact
Successful exploitation enables attackers to execute arbitrary OS commands on the affected system, potentially leading to complete system compromise, data exfiltration, or further lateral movement within the network.
Affected Products
- Nor2-io heim-mcp versions up to 0.1.3
- Systems utilizing the deploy_heim_application_to_cloud component
- Applications leveraging the affected registerTools function in src/tools.ts
Discovery Timeline
- 2026-04-05 - CVE CVE-2026-5602 published to NVD
- 2026-04-07 - Last updated in NVD database
Technical Details for CVE-2026-5602
Vulnerability Analysis
This vulnerability is classified as CWE-77 (Command Injection), which occurs when an application passes unsafe user-supplied data to a system shell. In heim-mcp, the registerTools function in src/tools.ts utilizes the Node.js child_process module's exec function to run shell commands. The exec function spawns a shell and executes the command within that shell, making it susceptible to command injection if user-controlled input is incorporated into the command string without proper sanitization.
The attack requires local access to the system, meaning an attacker would need some level of existing access or the ability to influence input parameters being processed by the vulnerable function. The exploit details have been publicly disclosed, increasing the risk of exploitation in unpatched environments.
Root Cause
The root cause of this vulnerability stems from the use of the exec function from Node.js's child_process module. This function executes commands through a shell interpreter, which parses special characters and allows command chaining. When user-controlled input is concatenated into command strings passed to exec, attackers can break out of the intended command context and inject additional commands using shell metacharacters such as ;, |, &&, or backticks.
Attack Vector
The attack requires local access to the system where heim-mcp is deployed. An attacker with the ability to influence parameters processed by the registerTools function can inject malicious commands that will be executed with the privileges of the heim-mcp process. The attack path involves the new_heim_application/deploy_heim_application/deploy_heim_application_to_cloud functionality, where deployment parameters may be manipulated to include shell metacharacters and malicious payloads.
// Security patch showing the fix (from src/tools.ts)
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
-import { exec } from "child_process";
+import { execFile } from "child_process";
import { z } from "zod";
import util from "util";
Source: GitHub Security Patch
The fix replaces exec with execFile, which executes the specified file directly without spawning a shell. This approach treats arguments as literal values rather than shell-interpreted strings, effectively neutralizing command injection attacks.
Detection Methods for CVE-2026-5602
Indicators of Compromise
- Unusual process spawning from heim-mcp application processes
- Unexpected shell commands or child processes associated with deployment operations
- Anomalous system calls or file access patterns during application deployment workflows
- Log entries showing malformed or suspicious deployment parameters containing shell metacharacters
Detection Strategies
- Monitor process creation events for unexpected child processes spawned by Node.js applications running heim-mcp
- Implement input validation logging to capture attempts to inject shell metacharacters in deployment parameters
- Deploy runtime application self-protection (RASP) solutions to detect command injection attempts
- Utilize SentinelOne's behavioral AI to identify anomalous command execution patterns
Monitoring Recommendations
- Enable comprehensive logging for the heim-mcp deployment functionality
- Monitor for process trees showing shell spawning from the heim-mcp Node.js process
- Set up alerts for execution of unexpected binaries or scripts during deployment operations
- Review audit logs for evidence of command chaining characters in application inputs
How to Mitigate CVE-2026-5602
Immediate Actions Required
- Update heim-mcp to a version containing the security patch (commit c321d8af25f77668781e6ccb43a1336f9185df37 or later)
- Review deployment logs for any suspicious activity that may indicate prior exploitation attempts
- Restrict local access to systems running vulnerable heim-mcp versions
- Implement network segmentation to limit potential lateral movement if compromise has occurred
Patch Information
The vendor has released a security patch addressing this vulnerability. The fix is available in commit c321d8af25f77668781e6ccb43a1336f9185df37. The patch modifies the src/tools.ts file to use execFile instead of exec, which prevents shell interpretation of command arguments. According to the CVE description, the vendor responded professionally and quickly released the fixed version.
For patch details, refer to:
Workarounds
- Restrict local access to the affected system until patching is complete
- Implement strict input validation on all parameters passed to deployment functions
- Consider disabling the deploy_heim_application_to_cloud functionality if not actively required
- Deploy application-level firewalls or input filtering to sanitize shell metacharacters
# Update heim-mcp to the patched version
cd /path/to/heim-mcp
git fetch origin
git checkout c321d8af25f77668781e6ccb43a1336f9185df37
npm install
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
