CVE-2026-48773
ProxySQL pre-auth heap overflow in MySQL and PostgreSQL first-packet handling
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | sysown |
| Product | proxysql |
| Published | Jun 19, 2026 |
Stay Ahead of the Next One
Get instant alerts for sysown proxysql
Be the first to know when new critical vulnerabilities affecting sysown proxysql are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
sysown / proxysql
>= 2.0.18, < 3.0.9