Vulnerability details

CVE-2026-48773

sysown proxysql

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

CVSS 3.1

9.8Critical

Official 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 scores

Score	Version	Source	Vector
9.8Critical	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
sysown	proxysql	>= 2.0.18, < 3.0.9	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/sysown/proxysql/releases/tag/v3.0.9 x_refsource_MISC
https://github.com/sysown/proxysql/security/advisories/GHSA-58ww-865x-grpr x_refsource_CONFIRM

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Details

Published: 2026-06-19
Last updated: 2026-06-22
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.68%

Probability of exploitation in 30 days

52.9%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-787
Out-of-bounds Write