CVE-2026-101784

A flaw was found in the query optimizer component of MySQL Server and MySQL Cluster. An authenticated attacker with high privileges and network access can exploit this vulnerability to cause a Denial of Service (DoS). Successful exploitation allows the attacker to hang or repeatedly crash the database server.

This vulnerability is rated as Moderate for Red Hat Enterprise Linux because exploitation requires elevated administrative privileges, significantly constraining the threat to authenticated users with high-level database permissions. While triggering the optimizer flaw can lead to service unavailability by halting or crashing the database daemon, it does not compromise data confidentiality or integrity. Standard deployments that strictly segregate administrative credentials and limit privileged database operations substantially diminish the operational risk of this defect.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.