CVE-2026-101784
Description
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.
Statement
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.9 | N/A | 4.9 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | High | N/A | High |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
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