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[USN-8457-2] MySQL vulnerabilities

Posted on 24 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8457-2
June 24, 2026

mysql-8.0 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in MySQL.

Software Description:
- mysql-8.0: MySQL database

Details:

USN-8457-1 fixed several vulnerabilities in MySQL. This update
provides the corresponding fixes for MySQL on Ubuntu 20.04 LTS

Original advisory 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)

Update instructions:

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

Ubuntu 20.04 LTS
mysql-router 8.0.46-0ubuntu0.20.04.1+esm3
Available with Ubuntu Pro
mysql-server 8.0.46-0ubuntu0.20.04.1+esm3
Available with Ubuntu Pro
mysql-server-8.0 8.0.46-0ubuntu0.20.04.1+esm3
Available with Ubuntu Pro
mysql-server-core-8.0 8.0.46-0ubuntu0.20.04.1+esm3
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8457-2
https://ubuntu.com/security/notices/USN-8457-1
CVE-2026-46862, CVE-2026-46863

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