Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. 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).

redhat RHSA-2026:5580: RHSA-2026:5580: mysql:8.0 security update (Moderate)

rocky_linux RLSA-2026:5580: RLSA-2026:5580: mysql:8.0 security update (Moderate)

oracle CPUJan2026: MySQL Server 8.4.8

oracle CPUJan2026: MySQL Cluster 8.0.45

oracle CPUJan2026: MySQL Cluster 8.4.8

oracle CPUJan2026: MySQL Server 8.0.45

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:4828 advisory.

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21941)
      * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21948)
      * mysql: InnoDB unspecified vulnerability (CPU Jan 2026) (CVE-2026-21936)
      * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21968)
      * mysql: DDL unspecified vulnerability (CPU Jan 2026) (CVE-2026-21937)
      * mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026) (CVE-2026-21964)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-4828 advisory.

    [8.0.45-1]
    - Rebase to 8.0.45

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:4828 advisory.

    MySQL is a multi-user, multi-threaded SQL database server. It consists of the MySQL server daemon (mysqld)     and many client programs and libraries.

    Security Fix(es):

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21941)

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21948)

    * mysql: InnoDB unspecified vulnerability (CPU Jan 2026) (CVE-2026-21936)

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21968)

    * mysql: DDL unspecified vulnerability (CPU Jan 2026) (CVE-2026-21937)

    * mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026) (CVE-2026-21964)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:4828 advisory.

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21941)

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21948)

    * mysql: InnoDB unspecified vulnerability (CPU Jan 2026) (CVE-2026-21936)

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21968)

    * mysql: DDL unspecified vulnerability (CPU Jan 2026) (CVE-2026-21937)

    * mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026) (CVE-2026-21964)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:4162 advisory.

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21941)
      * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21948)
      * mysql: InnoDB unspecified vulnerability (CPU Jan 2026) (CVE-2026-21936)
      * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21968)
      * mysql: DDL unspecified vulnerability (CPU Jan 2026) (CVE-2026-21937)
      * mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026) (CVE-2026-21964)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-4162 advisory.

    [8.4.8-1]
    - Rebase to 8.4.8

    [8.4.7-2]
    - Skip tests that are failing on Konflux
    - Resolves: ROK-831

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:4162 advisory.

    MySQL is a multi-user, multi-threaded SQL database server. MySQL is a client/server implementation     consisting of a server daemon (mysqld) and many different client programs and libraries. The base package     contains the standard MySQL client programs and generic MySQL files.

    Security Fix(es):

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21941)

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21948)

    * mysql: InnoDB unspecified vulnerability (CPU Jan 2026) (CVE-2026-21936)

    * mysql: Optimizer unspecified vulnerability (CPU Jan 2026) (CVE-2026-21968)

    * mysql: DDL unspecified vulnerability (CPU Jan 2026) (CVE-2026-21937)

    * mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026) (CVE-2026-21964)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8006-1 advisory.

    Multiple security issues were discovered in MySQL and this update includes a new upstream MySQL version to     fix these issues.

    MySQL has been updated to 8.0.45 in Ubuntu 20.04 LTS.

    In addition to security fixes, the updated packages contain bug fixes, new features, and possibly     incompatible changes.

    Please see the following for more information:

    https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-45.html https://www.oracle.com/security-     alerts/cpujan2026.html

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported     versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability     allows high privileged attacker with network access via multiple protocols to compromise MySQL Server.
    Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently     repeatable crash (complete DOS) of MySQL Server. (CVE-2026-21948)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7994-1 advisory.

    Multiple security issues were discovered in MySQL and this update includes new upstream MySQL versions to     fix these issues.

    MySQL has been updated to 8.0.45 in Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. Ubuntu 25.10 has been updated     to MySQL 8.4.8.

    In addition to security fixes, the updated packages contain bug fixes, new features, and possibly     incompatible changes.

    Please see the following for more information:

    https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-45.html     https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-8.html https://www.oracle.com/security-     alerts/cpujan2026.html

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The versions of MySQL Server installed on the remote host are affected by multiple vulnerabilities as referenced in the January 2026 CPU advisory.

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Docker Images (SQLite)). Supported     versions that are affected are 8.4.0-8.4.7. Easily exploitable vulnerability allows unauthenticated attacker with     network access via MySQL Protocol to compromise MySQL Server. Successful attacks of this vulnerability can result in     takeover of MySQL Server. (CVE-2025-6965)

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Packaging). Supported versions that are     affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows unauthenticated attacker     with network access via MySQL Protocol to compromise MySQL Server. Successful attacks of this vulnerability can result     in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. (CVE-2025-9230)

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are     affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows low privileged attacker     with network access via MySQL Protocol to compromise MySQL Server. Successful attacks of this vulnerability can result     in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. (CVE-2026-21968)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The versions of MySQL Server installed on the remote host are affected by multiple vulnerabilities as referenced in the January 2026 CPU advisory.

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Packaging). Supported versions that are     affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows unauthenticated attacker     with network access via MySQL Protocol to compromise MySQL Server. Successful attacks of this vulnerability can result     in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. (CVE-2025-9230)

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are     affected are 9.0.0-9.5.0. Easily exploitable vulnerability allows low privileged attacker with network access via MySQL     Protocol to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to     cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. (CVE-2026-21949)

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are     affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows low privileged attacker     with network access via MySQL Protocol to compromise MySQL Server. Successful attacks of this vulnerability can result     in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. (CVE-2026-21968)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The versions of MySQL Server installed on the remote host are affected by multiple vulnerabilities as referenced in the January 2026 CPU advisory.

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Packaging). Supported versions that are     affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows unauthenticated attacker     with network access via MySQL Protocol to compromise MySQL Server. Successful attacks of this vulnerability can result     in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. (CVE-2025-9230)

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are     affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows low privileged attacker     with network access via MySQL Protocol to compromise MySQL Server. Successful attacks of this vulnerability can result     in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. (CVE-2026-21968)

  - Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are     8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Vulnerable component is not exploitable without authentication. (CVE-2026-21936)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the ab01cb11-f911-11f0-b194-8447094a420f advisory.

    Oracle reports:
    Oracle reports multiple vulnerabilities in its MySQL server products.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
303186	AlmaLinux 9 : mysql (ALSA-2026:4828)	Nessus	Alma Linux Local Security Checks	medium
302897	Oracle Linux 9 : mysql (ELSA-2026-4828)	Nessus	Oracle Linux Local Security Checks	medium
302838	RHEL 9 : mysql (RHSA-2026:4828)	Nessus	Red Hat Local Security Checks	medium
302837	RockyLinux 9 : mysql (RLSA-2026:4828)	Nessus	Rocky Linux Local Security Checks	medium
301887	AlmaLinux 10 : mysql8.4 (ALSA-2026:4162)	Nessus	Alma Linux Local Security Checks	medium
301781	Oracle Linux 10 : mysql8.4 (ELSA-2026-4162)	Nessus	Oracle Linux Local Security Checks	medium
301689	RHEL 10 : mysql8.4 (RHSA-2026:4162)	Nessus	Red Hat Local Security Checks	medium
297946	Ubuntu 20.04 LTS : MySQL vulnerabilities (USN-8006-1)	Nessus	Ubuntu Local Security Checks	medium
297703	Linux Distros Unpatched Vulnerability : CVE-2026-21948	Nessus	Misc.	medium
297661	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : MySQL vulnerabilities (USN-7994-1)	Nessus	Ubuntu Local Security Checks	medium
296583	Oracle MySQL Server 8.4.x < 8.4.8 (January 2026 CPU)	Nessus	Databases	high
296582	Oracle MySQL Server 9.x.x < 9.6.0 (January 2026 CPU)	Nessus	Databases	high
296581	Oracle MySQL Server 8.0.x < 8.0.45 (January 2026 CPU)	Nessus	Databases	high
296523	FreeBSD : MySQL -- Multiple vulnerabilities (ab01cb11-f911-11f0-b194-8447094a420f)	Nessus	FreeBSD Local Security Checks	medium

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CVE-2026-21948

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