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Ubuntu 20.04 LTS MySQL Critical Denial Of Service Vuln USN-8457-2

ubuntu
Calendar Grey June 24, 2026
Dist Ubuntu Esm H88
MySQL receives critical security updates on Ubuntu 20.04 to fix several denial of service issues. Update recommended.
Several security issues were fixed in MySQL.

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)

Topics%20covered

Topics Covered

security advisory denial of service critical MySQL Ubuntu Ubuntu 20.04

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8457-2

Topics%20covered

Topics Covered

security advisory denial of service critical MySQL Ubuntu Ubuntu 20.04

Package Information

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