Ubuntu MySQL Important DoS Vulnerabilities USN-8457-1 CVE-2026-46862

ubuntu

June 22, 2026

Several security issues were fixed in MySQL.

Summary

Several security issues were fixed in MySQL.

Software Description:

- mysql-8.4: MySQL database

- mysql-8.0: MySQL database

Details:

It was discovered that MySQL Router incorrectly handled repeated TLS

protocol upgrade requests. An unauthenticated remote attacker could

possibly use this issue to cause MySQL Router to crash, resulting in a

denial of service. (CVE-2026-46862)

It was discovered that MySQL Server incorrectly handled connection

authentication. An unauthenticated remote attacker could possibly use this

issue to cause MySQL to crash, resulting in a denial of service.

(CVE-2026-46863)

Topics Covered

security advisory denial of service MySQL Ubuntu important updates

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  mysql-server                    8.4.10-0ubuntu0.26.04.1

Ubuntu 25.10
  mysql-server                    8.4.10-0ubuntu0.25.10.1

Ubuntu 24.04 LTS
  mysql-server-8.0                8.0.46-0ubuntu0.24.04.3

Ubuntu 22.04 LTS
  mysql-server-8.0                8.0.46-0ubuntu0.22.04.3

This update may use a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.