Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Proxysql | Proxysql | >= 2.0.18, < 3.0.9 |
Related Weaknesses (CWE)
References
- https://github.com/sysown/proxysql/releases/tag/v3.0.9Release Notes
- https://github.com/sysown/proxysql/security/advisories/GHSA-58ww-865x-grprExploitMitigationVendor Advisory
- https://github.com/sysown/proxysql/security/advisories/GHSA-58ww-865x-grprExploitMitigationVendor Advisory
FAQ
What is CVE-2026-48773?
CVE-2026-48773 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 fi...
How severe is CVE-2026-48773?
CVE-2026-48773 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-48773?
Check the references section above for vendor advisories and patch information. Affected products include: Proxysql Proxysql.