Multiple Vulnerabilities in MySQL Server Expose Systems to Denial of Service Attacks

On June 18, 2026, five critical vulnerabilities were disclosed in Oracle's MySQL Server, affecting versions 8.0.0-8.0.45, 8.4.0-8.4.8, and 9.0.0-9.6.0. These vulnerabilities, identified as CVE-2026-34270, CVE-2026-34271, CVE-2026-34304, CVE-2026-22004, and CVE-2026-34272, allow low to high privileged attackers to exploit the server via network access. Successful exploitation can lead to a denial of service (DoS), causing the server to hang or crash repeatedly. The vulnerabilities are easily exploitable and have a CVSS score ranging from 4.9 to 6.5, indicating significant availability impacts. All vulnerabilities were published on April 21, 2026, and are currently unpatched, urging immediate attention from system administrators. The affected systems are primarily used in various enterprise environments, making them a potential target for attackers. Security professionals are advised to monitor for any signs of exploitation.

Key Points: • Five vulnerabilities in MySQL Server could lead to denial of service attacks. • Affected versions include 8.0.0-8.0.45, 8.4.0-8.4.8, and 9.0.0-9.6.0. • Exploitation can be performed by low to high privileged attackers with network access.