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CVE-2026-48773— ProxySQL pre-auth heap overflow in MySQL and PostgreSQL first-packet handling

Quick assessment

Affected
sysown proxysql
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ProxySQL ProxySQL是ProxySQL组织开源的一个面向MySQL、PostgreSQL及其生态系统的领先数据库代理，支持高性能连接管理、高可用故障转移和实时查询分析。 ProxySQL 2.0.18版本至3.0.8及之前版本存在缓冲区错误漏洞，该漏洞源于MySQL和PostgreSQL协议首次读取路径中存在预身份验证堆内存损坏问题，可能导致远程未验证攻击者声明超大的第一个数据包长度，导致堆内存损坏。

CVSS 9.8 · Critical EPSS 0.69% · P51

Affected Version Matrix 1

VendorProduct Version RangeStatus
sysown proxysql >= 2.0.18, < 3.0.9 affected
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I. Basic Information for CVE-2026-48773

Vulnerability Information
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Vulnerability Title
ProxySQL pre-auth heap overflow in MySQL and PostgreSQL first-packet handling
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
ProxySQL 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ProxySQL ProxySQL是ProxySQL组织开源的一个面向MySQL、PostgreSQL及其生态系统的领先数据库代理，支持高性能连接管理、高可用故障转移和实时查询分析。 ProxySQL 2.0.18版本至3.0.8及之前版本存在缓冲区错误漏洞，该漏洞源于MySQL和PostgreSQL协议首次读取路径中存在预身份验证堆内存损坏问题，可能导致远程未验证攻击者声明超大的第一个数据包长度，导致堆内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sysown proxysql >= 2.0.18, < 3.0.9 -

II. Public POCs for CVE-2026-48773

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III. Intelligence Information for CVE-2026-48773

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Vendor Advisories for CVE-2026-48773 (1)

Vendor Pages for CVE-2026-48773 (1)

Same Patch Batch · sysown · 2026-06-19 · 3 CVEs total

CVE-2026-48772 10.0 CRITICAL ProxySQL: PROXY-Protocol-v1 UNKNOWN parses spoofed source IP, bypassing mysql_query_rules.
CVE-2026-48774 7.5 HIGH ProxySQL MCP run_sql_readonly executes side-effecting MySQL multi-statements despite read-

IV. Related Vulnerabilities

Same product: proxysql
Same vendor: sysown
Same weakness: CWE-787

V. Comments for CVE-2026-48773

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