How to fix SQL Injection (Legacy & Modern)
in Dart Frog
Executive Summary
SQL Injection in Dart Frog remains a critical vector when developers treat untrusted route parameters as trusted SQL fragments. Whether you are using raw PostgreSQL drivers or lightweight ORMs, failing to decouple the query logic from the data payload leads to total database compromise. In a Dart Frog environment, this usually occurs within middleware or route handlers where request context is piped directly into a database execution call.
The Vulnerable Pattern
// VULNERABLE: Direct string interpolation in a Dart Frog route import 'package:dart_frog/dart_frog.dart'; import 'package:postgres/postgres.dart';Future
onRequest(RequestContext context) async { final id = context.request.uri.queryParameters[‘id’]; final db = context.read (); // DANGER: String interpolation allows an attacker to escape the query context. // Payload example: ?id=1’; DROP TABLE users; — final result = await db.execute(“SELECT * FROM users WHERE id = ‘$id’”);
return Response.json(body: result); }
The Secure Implementation
The vulnerability exists because the database engine cannot distinguish between the developer's SQL commands and the user's input when they are concatenated into a single string. The 'Modern' fix utilizes Prepared Statements (via parameterized queries). By using the '@' or '?' placeholders, the Dart postgres driver sends the SQL template and the user data to the database in separate phases. The database engine pre-compiles the SQL logic and then inserts the data as literal values, neutralizing any embedded SQL commands within the input.
// SECURE: Parameterized queries using the 'postgres' package import 'package:dart_frog/dart_frog.dart'; import 'package:postgres/postgres.dart';Future
onRequest(RequestContext context) async { final id = context.request.uri.queryParameters[‘id’]; final db = context.read (); // FIX: Use the Sql.named() or Sql.indexed() helpers to bind parameters. // This ensures the input is treated strictly as data, not executable code. final result = await db.execute( Sql.named(‘SELECT * FROM users WHERE id = @userId’), parameters: {‘userId’: id}, );
return Response.json(body: result); }
Your Dart Frog API
might be exposed to SQL Injection (Legacy & Modern)
74% of Dart Frog apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
Free Tier • No Credit Card • Instant Report
Verified by Ghost Labs Security Team
This content is continuously validated by our automated security engine and reviewed by our research team. Ghost Labs analyzes over 500+ vulnerability patterns across 40+ frameworks to provide up-to-date remediation strategies.