CVE-2026-48773 | ProxySQL is a proxy for MySQL and its forks, as well as Post… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2026-48773
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-22 19:39 UTC
Published: 2026-06-19 19:27 UTC
Last updated: 2026-06-19 19:27 UTC
Primary CWE: CWE-787
CWE-787: Out-of-bounds Write
Vendor / Product: sysown / proxysql
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products (1)

Vendor	Product	Platform	Versions
sysown	proxysql	—	>= 2.0.18, < 3.0.9

Weakness (CWE)

CWE	Source	Description
CWE-787	cna	CWE-787: Out-of-bounds Write

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (2)

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