Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Parser). 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 low 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 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).

A flaw was found in the MySQL Server Parser component. An authenticated remote attacker with low privileges can exploit this vulnerability through network access using multiple protocols. A successful attack can cause the service to hang or repeatedly crash, resulting in a Denial of Service (DoS).

This vulnerability is evaluated as Moderate impact because successful exploitation requires an attacker to possess valid database credentials with network reachability, and the consequence is strictly limited to service availability rather than arbitrary code execution or data leakage. In typical Red Hat Enterprise Linux environments, database services are isolated within protected internal network segments and restricted to authorized client applications. An authenticated user submitting crafted SQL syntax to the server parser can trigger a daemon crash or unresponsive state. Because unauthorized data disclosure or modification is prevented and low-privileged access is a prerequisite, this flaw does not present a high-severity threat. 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-2026-101802 https://nvd.nist.gov/vuln/detail/CVE-2026-101802 https://www.oracle.com/security-alerts/cpuoct2026.html