CVE-2026-48773 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-48773CRITICAL

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .0047   38.6     —

AFFECTED
  Product   Versions              Fixed
  proxysql  >= 2.0.18, < 3.0.9 –  —

TIMELINE
  May 22  Reserved by GitHub_M
  Jun 19  EXPLOIT PUBLISHED — CVE-2026-48773 (sysown proxysql). Public exploit reference added.
  Jun 19  Published (CNA: GitHub_M)

CWE-787 · CNA: GitHub_M · CVSS v3.1 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 22, 2026	Reserved	Reserved by GitHub_M
June 19, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-48773 (sysown proxysql). Public exploit reference added.
June 19, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
sysown	proxysql	—	>= 2.0.18, < 3.0.9	—

Weaknesses

CWE-787

References (2)

https://github.com/sysown/proxysql/releases/tag/v3.0.9 [Release Notes]
https://github.com/sysown/proxysql/security/advisories/GHSA-58ww-865x-grpr [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-48773 at cve.org

Vendors: sysown

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-48773 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.