sql-injection-prevention

The code is not malware, but it contains a clearly documented and executable SQL injection vulnerability in vulnerable_query because untrusted input is inserted into SQL through an f-string. The method should be removed or changed to a bound parameter query. The hardcoded example database password should be replaced with secure configuration, and raw_query_secure should avoid returning password_hash unless required.

The fragment is primarily an educational JDBC example. It contains one clear SQL injection vulnerability in vulnerableQuery because userInput is concatenated into SQL. The other query methods use prepared statements or validated allowlists. No malicious supply-chain behavior, data exfiltration, persistence, or hidden backdoor is present in the supplied code. Password hashing and secure credential handling should be enforced by surrounding application code.

The code is primarily a PostgreSQL access module with generally appropriate parameterized queries and allowlist handling. It contains one explicit, high-impact SQL injection vulnerability in vulnerableQuery due to direct interpolation of userId. The fund-transfer method also has significant application-level integrity risks if exposed to untrusted callers because it lacks authorization, positive-amount validation, balance enforcement, and row-count checks. No evidence of intentional malware or supply-chain sabotage is present.