CVE-2026-3064: Hummerrisk RCE Vulnerability

CVE-2026-3064 Overview

A command injection vulnerability has been discovered in HummerRisk, an open-source cloud security platform. The vulnerability affects the ResourceCreateService.java file within the Cloud Task Scheduler component, where improper handling of the regionId argument allows attackers to inject arbitrary operating system commands. This vulnerability can be exploited remotely by authenticated users, potentially leading to unauthorized command execution on the underlying server.

Critical Impact

Remote attackers with low privileges can exploit this command injection vulnerability to execute arbitrary commands on the HummerRisk server, potentially compromising the entire cloud security infrastructure and gaining access to sensitive cloud environment data.

Affected Products

• HummerRisk versions up to and including 1.5.0
• HummerRisk Cloud Task Scheduler component
• ResourceCreateService.java file handling regionId parameter

Discovery Timeline

• February 24, 2026 - CVE-2026-3064 published to NVD
• February 24, 2026 - Last updated in NVD database

Technical Details for CVE-2026-3064

Vulnerability Analysis

This vulnerability is classified as a command injection flaw (CWE-77) with an underlying injection weakness (CWE-74). The issue resides in the Cloud Task Scheduler component of HummerRisk, specifically within the ResourceCreateService.java file. When the application processes the regionId argument, it fails to properly sanitize or validate user-supplied input before incorporating it into system commands.

The vulnerability allows authenticated attackers to manipulate the regionId parameter to inject malicious commands that are then executed by the underlying operating system. The network-accessible nature of this vulnerability means that any authenticated user with access to the Cloud Task Scheduler functionality can potentially exploit it to execute arbitrary commands on the server hosting HummerRisk.

The exploit details have been publicly disclosed, and the vendor was contacted regarding this vulnerability but did not respond. This lack of response increases the risk for organizations running affected versions, as no official patch timeline has been established.

Root Cause

The root cause of this vulnerability is improper input validation and sanitization of the regionId parameter within the ResourceCreateService.java file. The application appears to directly incorporate user-controlled input into system command construction without adequate escaping or validation, enabling command injection attacks. This represents a failure to follow secure coding practices for handling untrusted input that will be used in command execution contexts.

Attack Vector

The attack vector is network-based, requiring authentication but no user interaction. An attacker with valid credentials to the HummerRisk platform can craft a malicious request to the Cloud Task Scheduler component, embedding shell metacharacters or command separators within the regionId parameter. The vulnerable code path then executes the attacker's injected commands with the privileges of the HummerRisk application process.

The attack typically involves injecting command separators (such as ;, |, &&, or backticks) followed by malicious commands into the regionId field. When the vulnerable code constructs and executes the system command, the injected payload is executed alongside or instead of the intended operation. For detailed technical information about this vulnerability, refer to the VulDB advisory and the GitHub Issue Discussion.

Detection Methods for CVE-2026-3064

Indicators of Compromise

• Unusual process spawning from the HummerRisk Java application process, particularly shell interpreters like /bin/sh or /bin/bash
• Suspicious network connections originating from the HummerRisk server to unknown external IP addresses
• Unexpected file system modifications or creation of new files in HummerRisk directories
• Anomalous entries in Cloud Task Scheduler logs containing shell metacharacters in regionId values

Detection Strategies

• Monitor application logs for regionId parameters containing suspicious characters such as ;, |, &&, `, $(), or newline characters
• Implement Web Application Firewall (WAF) rules to detect command injection patterns in requests to Cloud Task Scheduler endpoints
• Deploy runtime application self-protection (RASP) solutions to detect command execution attempts from the Java application
• Review authentication logs for accounts accessing Cloud Task Scheduler functionality with unusual frequency or patterns

Monitoring Recommendations

• Enable verbose logging for the ResourceCreateService.java component to capture all regionId parameter values
• Configure intrusion detection systems (IDS) to alert on process execution anomalies from Java application contexts
• Implement file integrity monitoring on critical system directories and HummerRisk installation paths
• Set up network monitoring to detect outbound connections from the HummerRisk server to suspicious destinations

How to Mitigate CVE-2026-3064

Immediate Actions Required

• Restrict network access to the HummerRisk Cloud Task Scheduler component to trusted administrative networks only
• Implement strict input validation for the regionId parameter using allowlist patterns at the application gateway or WAF level
• Review and audit user accounts with access to Cloud Task Scheduler functionality, removing unnecessary privileges
• Consider temporarily disabling the affected Cloud Task Scheduler feature if operationally feasible

Patch Information

As of the last update, the vendor (HummerRisk) has not responded to the vulnerability disclosure and no official patch is available. Organizations should monitor the HummerRisk project for any future security updates. Given the lack of vendor response, users should implement compensating controls and consider the long-term viability of using this software.

Workarounds

• Deploy a reverse proxy or WAF in front of HummerRisk to filter requests containing command injection patterns in the regionId parameter
• Implement network segmentation to isolate the HummerRisk server from critical infrastructure and limit the impact of potential compromise
• Run the HummerRisk application in a containerized environment with minimal privileges and restricted system call access
• Apply operating system-level hardening such as SELinux or AppArmor profiles to restrict the Java application's ability to execute arbitrary commands

# Example WAF rule for blocking command injection in regionId parameter
# ModSecurity rule to detect common command injection patterns
SecRule ARGS:regionId "@rx [;|&`$()\\n]" \
    "id:100001,\
    phase:2,\
    block,\
    log,\
    msg:'Potential command injection in regionId parameter - CVE-2026-3064',\
    severity:'CRITICAL'"