Postgres

PostgreSQL Security Best Practices

Secure your PostgreSQL database with these essential practices. From parameterized queries to role management.

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PostgreSQL has robust security features, but they require proper configuration. These practices help you leverage PostgreSQL's security capabilities effectively.

Quick Wins

Search codebase for string concatenation in SQL
Audit database users and their privileges
Verify SSL is enabled for connections
Check pg_hba.conf for overly permissive rules
Test for SQL injection in user inputs

Security Best Practices

#1Use Parameterized Queries

critical

Never concatenate user input into SQL queries. Always use parameterized queries or prepared statements.

Implementation

Use query parameters ($1, $2, etc.) instead of string concatenation

Don't do this
SELECT * FROM users WHERE email = '${email}'
Do this instead
SELECT * FROM users WHERE email = $1

#2Apply Least Privilege Principle

critical

Create application users with minimum required permissions. Never use the postgres superuser for applications.

Implementation

Create roles with specific table/column permissions using GRANT statements

#3Enable SSL Connections

high

Encrypt all connections between applications and PostgreSQL.

Implementation

Configure ssl=true in connection string, use sslmode=verify-full for production

#4Configure pg_hba.conf Properly

high

Control which hosts can connect and what authentication methods they use.

Implementation

Use scram-sha-256 authentication, restrict by IP, require SSL

#5Use Row Level Security (RLS)

high

For multi-tenant applications, use RLS to isolate data at the database level.

Implementation

Enable RLS on tables and create policies that reference current_user or application context

#6Encrypt Sensitive Data

medium

Use pgcrypto or application-level encryption for sensitive columns.

Implementation

Encrypt PII and sensitive data before storage

Common Mistakes to Avoid

Concatenating user input into queries

Why it's dangerous:

SQL injection remains the #1 database attack

How to fix:

Always use parameterized queries or prepared statements

Using postgres superuser for applications

Why it's dangerous:

Superuser can do anything including dropping databases

How to fix:

Create application-specific users with limited permissions

Allowing all hosts in pg_hba.conf

Why it's dangerous:

Any network access can attempt authentication

How to fix:

Restrict to specific IPs or networks, require SSL

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Frequently Asked Questions

Is PostgreSQL secure by default?

PostgreSQL has good security features, but requires configuration. Enable SSL, configure pg_hba.conf properly, and always use parameterized queries.

Should I use an ORM for security?

ORMs generally use parameterized queries automatically, which prevents SQL injection. However, raw SQL queries in ORMs still need proper parameterization.

What is Row Level Security?

RLS lets you define policies at the database level that restrict which rows users can see or modify. It's especially useful for multi-tenant applications sharing a database.

Related PostgreSQL Security Resources

PostgreSQL Security OverviewPostgreSQL Security IssuesPostgreSQL Security RisksIs PostgreSQL Safe?

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Last updated: January 2026