CVE-2024-27304: pgx SQL Injection via Protocol Message Size Overflow

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-06 · updated 2026-06-17
Weakness: CWE-89

Description

pgx is a PostgreSQL driver and toolkit for Go. SQL injection can occur if an attacker can cause a single query or bind message to exceed 4 GB in size. An integer overflow in the calculated message size can cause the one large message to be sent as multiple messages under the attacker's control. The problem is resolved in v4.18.2 and v5.5.4. As a workaround, reject user input large enough to cause a single query or bind message to exceed 4 GB in size.

Affected products

github.com/jackc/pgproto3/v2: before 2.3.3 — fixed in 2.3.3
jackc pgx: before 4.18.2; from 5.0.0 before 5.5.4 — fixed in 4.18.2, 5.5.4

How to fix

Upgrade to a fixed version: github.com/jackc/pgproto3/v2 2.3.3; jackc pgx 4.18.2, 5.5.4. Check the vendor advisory for mitigations.

References

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