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 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

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 9.0.0-9.5.0. Easily exploitable vulnerability allows low 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-2026-21950)

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

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 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
297722	Linux Distros Unpatched Vulnerability : CVE-2026-21950	Nessus	Misc.	medium
296582	Oracle MySQL Server 9.x.x < 9.6.0 (January 2026 CPU)	Nessus	Databases	high
296523	FreeBSD : MySQL -- Multiple vulnerabilities (ab01cb11-f911-11f0-b194-8447094a420f)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2026-21950

medium

Tenable Plugins

medium

high

medium