Description
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. 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).
Published: 2026-04-21
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Availability (Denial of Service)
Action: Patch
AI Analysis

Impact

The flaw resides in the Group Replication Plugin of Oracle MySQL Server. An attacker with low privileges and network connectivity can trigger a hang or repeatable crash that takes the server offline. The exploit does not grant further compromise and only corrupts availability, as reflected by the CVSS 3.1 vector AV:N/AC:L/PR:L/C:N/I:N/A:H.

Affected Systems

Oracle MySQL Server 8.0.0 through 8.0.45, 8.4.0 through 8.4.8, and 9.0.0 through 9.6.0 are affected. Any installation of the Group Replication Plugin in these versions can be impacted.

Risk and Exploitability

The CVSS base score of 6.5 indicates a moderate risk to availability, while the reported EPSS score of 0.0004 (<1%) indicates a very low but nonzero exploitation probability. The vulnerability is not yet in the CISA KEV catalog. Attackers can reach the vulnerable code via the standard MySQL protocols over the network, using a low‑privilege account to execute the crash trigger.

Generated by OpenCVE AI on April 27, 2026 at 19:39 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Update Oracle MySQL Server to a version newer than 8.0.45, 8.4.8, or 9.6.0, which contain the fixed Group Replication Plugin.
  • If Group Replication is not required, remove or disable the plugin to eliminate the attack surface.
  • Restrict network access to the MySQL instance to trusted hosts and consider applying firewall rules to block unnecessary ports, thereby limiting low‑privilege attacker reach.

Generated by OpenCVE AI on April 27, 2026 at 19:39 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 23 Apr 2026 12:15:00 +0000

Type Values Removed Values Added
Title Denial of Service via Group Replication Plugin Crash in Oracle MySQL Server mysql: Group Replication Plugin unspecified vulnerability (CPU Apr 2026)
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 22 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 22 Apr 2026 09:15:00 +0000

Type Values Removed Values Added
Title Denial of Service via Group Replication Plugin Crash in Oracle MySQL Server
Weaknesses CWE-770

Wed, 22 Apr 2026 07:30:00 +0000

Type Values Removed Values Added
Title MySQL Server Group Replication Plugin Denial of Service via Low‑Privilege Network Attack
Weaknesses CWE-739

Wed, 22 Apr 2026 03:00:00 +0000

Type Values Removed Values Added
Title MySQL Server Group Replication Plugin Denial of Service via Low‑Privilege Network Attack
Weaknesses CWE-739

Wed, 22 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
Description Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Group Replication Plugin). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. 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).
First Time appeared Oracle
Oracle mysql Server
CPEs cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
Vendors & Products Oracle
Oracle mysql Server
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

Oracle Mysql Server
cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-04-22T13:54:29.141Z

Reserved: 2026-03-26T19:48:45.674Z

Link: CVE-2026-34270

cve-icon Vulnrichment

Updated: 2026-04-22T13:54:22.362Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-21T21:16:30.717

Modified: 2026-04-23T15:06:15.327

Link: CVE-2026-34270

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-04-21T00:00:00Z

Links: CVE-2026-34270 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-27T19:45:11Z

Weaknesses