CVE-2026-34270

Received Received - Intake

Denial of Service in Oracle MySQL Group Replication Plugin

Publication date: 2026-04-21

Last updated on: 2026-04-23

Assigner: Oracle

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).

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-21

Last Modified

2026-04-23

Generated

2026-07-06

AI Q&A

2026-04-22

EPSS Evaluated

2026-07-05

NVD

CVE-2026-34270

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	mysql_server	From 8.0.0 (inc) to 8.0.45 (inc)
oracle	mysql_server	From 8.4.0 (inc) to 8.4.8 (inc)
oracle	mysql_server	From 9.0.0 (inc) to 9.6.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This vulnerability exists in the MySQL Server product of Oracle MySQL, specifically in the Server: Group Replication Plugin component. It affects supported versions 8.0.0-8.0.45, 8.4.0-8.4.8, and 9.0.0-9.6.0.

The vulnerability is easily exploitable by a low privileged attacker who has network access through multiple protocols. Such an attacker can compromise the MySQL Server.

Successful exploitation can result in the attacker causing the MySQL Server to hang or crash repeatedly, leading to a complete denial of service (DoS).

Impact Analysis

The primary impact of this vulnerability is on the availability of the MySQL Server.

An attacker with low privileges and network access can cause the server to hang or crash repeatedly, resulting in a denial of service (DoS).

This means that legitimate users may be unable to access the database services, potentially disrupting business operations that rely on MySQL Server.

Compliance Impact

This vulnerability results in a denial of service (DoS) condition by allowing an attacker to cause the MySQL Server to hang or crash repeatedly. It does not impact confidentiality or integrity of data.

Since the vulnerability affects availability only and does not lead to unauthorized data access or modification, its direct impact on compliance with standards like GDPR or HIPAA, which primarily focus on data privacy and integrity, is limited.

However, availability is also a component of many compliance frameworks, so prolonged or repeated outages caused by this vulnerability could potentially affect compliance related to system availability requirements.

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