UBUNTU-CVE-2026-101784: Medium severity ubuntu/mysql-5.5 vulnerability

Q: What level of access would an attacker need?

An attacker needs high privileges and network access through one of the affected products' supported protocols. No user interaction is required.

Q: What is the expected security impact?

The stated impact is availability only: an attacker may cause a hang or a frequently repeatable crash resulting in complete denial of service. The CVSS vector lists no confidentiality or integrity impact.

Q: Which upstream product versions are affected?

Affected MySQL Server versions are 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1. Affected MySQL Cluster versions are 8.0.0 through 8.0.49, 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1.

Published Oct 20, 2026

Updated

Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are MySQL Server: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1; MySQL Cluster: 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3 and 26.7.0-26.7.1. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

Affected Software

17 affected componentsFixes available

ubuntu/mysql-5.5*

ubuntu/mysql-5.7*

ubuntu/mariadb-10.0*

ubuntu/percona-server-5.6*

ubuntu/percona-xtradb-cluster-5.6*

ubuntu/mysql-5.7*

ubuntu/mariadb-10.1*

ubuntu/mysql-8.0*

ubuntu/mariadb-10.3*

ubuntu/mariadb-10.6*

ubuntu/mysql-8.0<8.0.46-0ubuntu0.22.04.5

8.0.46-0ubuntu0.22.04.5

ubuntu/mariadb*

ubuntu/mysql-8.0<8.0.46-0ubuntu0.24.04.5

8.0.46-0ubuntu0.24.04.5

ubuntu/mariadb*

ubuntu/mysql-9.7<9.7.4-0ubuntu0.26.10.1

9.7.4-0ubuntu0.26.10.1

ubuntu/mariadb*

ubuntu/mysql-8.4<8.4.13-0ubuntu0.26.04.2

8.4.13-0ubuntu0.26.04.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/mysql-8.0 to a version that resolves this vulnerability.
Fixed in 8.0.46-0ubuntu0.22.04.5
Upgrade
Upgrade ubuntu/mysql-8.0 to a version that resolves this vulnerability.
Fixed in 8.0.46-0ubuntu0.24.04.5
Upgrade
Upgrade ubuntu/mysql-9.7 to a version that resolves this vulnerability.
Fixed in 9.7.4-0ubuntu0.26.10.1
Upgrade
Upgrade ubuntu/mysql-8.4 to a version that resolves this vulnerability.
Fixed in 8.4.13-0ubuntu0.26.04.2

Event History

Oct 20, 2026

CVE Published

via OSV·10:18 PM

Data Sourced

via OSV·10:18 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

What level of access would an attacker need?

An attacker needs high privileges and network access through one of the affected products' supported protocols. No user interaction is required.

What is the expected security impact?

The stated impact is availability only: an attacker may cause a hang or a frequently repeatable crash resulting in complete denial of service. The CVSS vector lists no confidentiality or integrity impact.

Which upstream product versions are affected?

Affected MySQL Server versions are 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1. Affected MySQL Cluster versions are 8.0.0 through 8.0.49, 8.4.0 through 8.4.12, 9.7.0 through 9.7.3, and 26.7.0 through 26.7.1.

UBUNTU-CVE-2026-101784: Medium severity ubuntu/mysql-5.5 vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

What level of access would an attacker need?

What is the expected security impact?

Which upstream product versions are affected?

Company

Resources

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