What is CVE-2026-48773?

CVE-2026-48773 is a critical-severity vulnerability in Sysown Proxysql, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-06-19.

How severe is CVE-2026-48773?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Sysown Proxysql

CVE-2026-48773

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 unauthenticate…

Vulnerability class: Buffer Overflow

EPSS: 0.007 (47.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Sysown Proxysql — versions >= 2.0.18, < 3.0.9

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-48773?: CVE-2026-48773 is a critical-severity vulnerability in Sysown Proxysql, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-06-19.
How severe is CVE-2026-48773?: Critical severity. CVSS v3 base score is 9.8 out of 10.