Is PostgreSQL Quantum Safe?
Not yet. PostgreSQL uses OpenSSL for TLS connections, which means PQC support depends on OpenSSL PQC implementation. PostgreSQL itself has not added native PQC support.
Key Takeaway: PostgreSQL is NOT quantum safe. Scan your PostgreSQL infrastructure with QScout. Plan OpenSSL upgrades to PQC-capable versions (3.x with oqs-provider). Test PQC TLS connections in staging before production deployment.
- Modality
- Database
- Vulnerability
- PostgreSQL TLS connections use classical key exchange via OpenSSL, vulnerable to quantum attack. PQC migration path exists through OpenSSL PQC provider upgrades.
- NIST status
- PostgreSQL relies on OpenSSL for TLS. OpenSSL 3.x supports NIST PQC standards via oqs-provider. PostgreSQL can inherit PQC support through library upgrades.
- Replaced by
- PostgreSQL TLS will migrate to ML-KEM via OpenSSL PQC provider upgrades
- Deprecation
- PostgreSQL's PQC timeline depends on OpenSSL. OpenSSL oqs-provider is available now for testing.
Technical Analysis
PostgreSQL is NOT quantum safe today, but its dependency on OpenSSL provides a clear PQC path.
Current State
PostgreSQL uses OpenSSL (or GnuTLS) for TLS connections. The TLS key exchange uses classical RSA or ECDH. PostgreSQL's pgcrypto extension uses classical algorithms.
PQC Progress
PostgreSQL's PQC readiness depends on OpenSSL:
- OpenSSL 3.x: Includes an oqs-provider (via Open Quantum Safe project) that adds ML-KEM and ML-DSA support.
- PostgreSQL: No native PQC changes needed if OpenSSL supports PQC — PostgreSQL delegates TLS to the underlying library.
- Connection string: Once OpenSSL supports PQC cipher suites, PostgreSQL can use them via ssl_ciphers configuration.
- pgcrypto: Extension for application-level encryption — does not yet support PQC algorithms.
HNDL Risk
Database connections carry SQL queries, result sets, and authentication credentials. PostgreSQL connections to application servers are high-value HNDL targets.
What Organizations Should Do
Audit all PostgreSQL connections, replication links, and pgbouncer configurations. Plan to upgrade OpenSSL to PQC-capable versions. Use QScout to discover all database cryptographic dependencies.
At a glance
| Full Name | PostgreSQL Database |
| Category | database |
| Quantum Vulnerability | PostgreSQL TLS connections use classical key exchange via OpenSSL, vulnerable to quantum attack. PQC migration path exists through OpenSSL PQC provider upgrades. |
| NIST Status | PostgreSQL relies on OpenSSL for TLS. OpenSSL 3.x supports NIST PQC standards via oqs-provider. PostgreSQL can inherit PQC support through library upgrades. |
| Deprecation Timeline | PostgreSQL's PQC timeline depends on OpenSSL. OpenSSL oqs-provider is available now for testing. |
| Replaced By | PostgreSQL TLS will migrate to ML-KEM via OpenSSL PQC provider upgrades |
Migration Guidance
Scan your PostgreSQL infrastructure with QScout. Plan OpenSSL upgrades to PQC-capable versions (3.x with oqs-provider). Test PQC TLS connections in staging before production deployment.
How Qtonic Quantum Can Help
Don’t Know Where PostgreSQL Lives in Your Stack?
QScout discovers instances of PostgreSQL across your infrastructure in 7 days — designed to minimize operational disruption. 72-hour time to first findings.