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Vulnerability record · CVE-2026-48773 · published 19 June 2026

CVE-2026-48773: Proxysql out-of-bounds write vulnerability

Proxysql · Proxysql

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.

9.8 CVSS 3.1 Critical EPSS 0.69% · top 49.2% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score
0.69%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
10 Aug 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-48773), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.