CVE-2026-4230

What is this vulnerability?

CVE-2026-4230 is categorized as a critical SQL Injection flaw. Based on our vulnerability intelligence, this issue occurs when the application fails to securely handle untrusted data boundaries.

A vulnerability has been found in vanna-ai vanna up to 2.0.2. Affected is the function update_sql of the file src/vanna/legacy/flask/init.py of the com...

This architectural defect enables adversaries to bypass intended security controls, directly manipulating the application's execution state or data layer. Immediate strategic intervention is required.

Risk Assessment

Impact on Systems

✅ Data Exfiltration: Full compromise of the database schema, allowing extraction of all tables, user records, and PII.

✅ Authentication Bypass: Attackers can manipulate boolean logic in authentication queries to log in as administrators.

✅ Remote Code Execution: In severe configurations (e.g., xp_cmdshell in MSSQL), attackers can execute shell commands on the database underlying OS.

How to fix this issue?

Implement the following strategic mitigations immediately to eliminate the attack surface.

1. Prepared Statements Migrate entirely to parameterized queries (Prepared Statements) or an Object-Relational Mapper (ORM) to decouple code from data.

2. Input Validation Implement rigorous allow-list input validation for all sorting, filtering, and query parameters.

3. Principle of Least Privilege Ensure the database service account has the minimum necessary privileges, restricting DROP, TRUNCATE, and system execution commands.

Vulnerability Signature

// Example of a vulnerable Node.js/Express snippet

const category = req.query.category;

// DANGEROUS: Direct string concatenation of user input
const query = `SELECT * FROM products WHERE category = '$\{category\}'`;

db.query(query, (err, result) =\> \{
  if (err) throw err;
  console.log(result);
\});

// SECURED: Using parameterized queries avoids SQL injection
const category = req.query.category; // Ensure scope appropriately

// Safe: The database driver treats '?' strictly as data, not executable code
const query = 'SELECT * FROM products WHERE category = ?';

db.query(query, [category], (err, result) =\> \{
  if (err) throw err;
  console.log(result);
\});

References and Sources

• NVD — CVE-2026-4230
• MITRE — CVE-2026-4230
• CWE-74 — MITRE CWE
• CWE-74 Details
• CWE-89 — MITRE CWE
• CWE-89 Details
• Application Security Vulnerabilities
• AI Code Security Vulnerabilities

Vulnerability Code Signature

Attack Data Flow

Vulnerable Code Pattern

# ❌ VULNERABLE: Unsanitized Input Flow
def process_request(request):
    user_input = request.GET.get('data')
    # Taint sink: processing untrusted data
    execute_logic(user_input)
    return {"status": "success"}

Secure Code Pattern

# ✅ SECURE: Input Validation & Sanitization
def process_request(request):
    user_input = request.GET.get('data')
    
    # Sanitized boundary check
    if not is_valid_format(user_input):
        raise ValueError("Invalid input format")
        
    sanitized_data = sanitize(user_input)
    execute_logic(sanitized_data)
    return {"status": "success"}

How Precogs Detects This

Precogs AI Analysis Engine maps untrusted input directly to execution sinks to catch complex application security vulnerabilities.\n