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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-48773

ProxySQL pre-auth heap overflow in MySQL and PostgreSQL first-packet handling

Description

ProxySQL is a proxy for MySQL and its forks, as well as PostgreSQL. Versions 2.0.18 through 3.0.8 have a pre-authentication heap memory corruption vulnerability in the MySQL and PostgreSQL protocol first-read paths. A remote unauthenticated client can declare an oversized first packet length, and ProxySQL passes that attacker-controlled length directly to `recv()` while writing into a fixed 32 KB input queue. Version 3.0.9 patches the issue.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

sysown proxysql

  • >= 2.0.18, < 3.0.9affected

References