CVE-2026-34308
Received Received - Intake

Denial of Service in Oracle MySQL Server JSON Component

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: JSON). 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).

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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-2026-34308

Affected Vendors & Products

Showing 3 associated CPEs
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
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

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Executive Summary

This vulnerability exists in the MySQL Server product of Oracle MySQL, specifically in the Server component related to JSON. It affects supported versions 8.0.0 to 8.0.45, 8.4.0 to 8.4.8, and 9.0.0 to 9.6.0.

The vulnerability is easily exploitable by a low privileged attacker who has network access through multiple protocols. Exploiting this vulnerability allows the attacker to compromise the MySQL Server.

Successful exploitation can cause the MySQL Server to hang or crash repeatedly, resulting in a complete denial of service (DoS).

Impact Analysis

The main 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.

This results in a complete denial of service (DoS), meaning legitimate users and applications will be unable to access the database services during the attack.

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