Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Client programs). 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 unauthenticated 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 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A flaw was found in the Client programs component of MySQL. This issue may allow an attacker to impact the confidentiality, integrity, and/or availability of MySQL Server depending on the vulnerability details. Refer to the Oracle CPU advisory for component-specific impact.

This vulnerability is rated as Important for Red Hat environments because unauthenticated remote attackers can induce a total denial of service against the MySQL server without requiring privileges or user interaction. While standard deployments usually restrict database listening ports to internal networks or localhost, exposed instances face complete service unavailability through process hangs or crashes. The lack of authentication prerequisites and severe impact on service availability warrant an Important rather than Moderate rating, though confidentiality and integrity remain unaffected. Red Hat Enterprise Linux 10 Affected mysql8.4 Red Hat Enterprise Linux 6 Not affected mysql Red Hat Enterprise Linux 9 Affected mysql Red Hat Hardened Images Not affected mariadb10.11 Red Hat Hardened Images Not affected mariadb11.8 https://www.cve.org/CVERecord?id=CVE-2026-101679 https://nvd.nist.gov/vuln/detail/CVE-2026-101679 https://www.oracle.com/security-alerts/cpuoct2026.html