Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessObtain high-privileged MySQL credentials
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DeliveryConnect to MySQL over network protocol
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ExploitCraft malicious JSON Duality query
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ExecutionTrigger unhandled condition in JSON Duality component
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PersistMySQL Server hangs or crashes repeatedly
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ImpactDatabase service becomes unavailable to all users
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK
1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Exploitation requires a high-privileged MySQL account (PR:H) - such as root or a DBA-equivalent user - with network connectivity to the MySQL Server or Cluster instance. The attacker must be able to interact with the Server: JSON Duality component, meaning the feature must be accessible within the target's MySQL configuration. The vulnerability is scoped exclusively to MySQL Server and MySQL Cluster versions 9.7.0 and 9.7.1; no earlier versions are listed as affected. No user interaction is required (UI:N), and attack complexity is low (AC:L), meaning exploitation is straightforward once privileged credentials are in hand. Primary limiting factors are: (1) the high privilege requirement - unauthenticated or low-privileged exploitation is not possible per the CVSS:3.1/PR:H vector; (2) the narrow affected version range (9.7.0-9.7.1 only); and (3) the impact is limited to availability - there is no confidentiality or integrity exposure. |
| Impact | The CVSS 3.1 score of 4.9 (Medium) is appropriate here and the vector (AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H) accurately reflects the attack profile. The high privilege requirement (PR:H) is the dominant risk-limiting factor - exploitation is not achievable without control of a high-privileged MySQL account such as DBA or root. Attack complexity is low (AC:L) and no user interaction is needed, meaning that once credentials are obtained, exploitation is straightforward. The impact is purely availability-based: no confidentiality or integrity risk is present, making this a targeted DoS rather than a data breach vector. The vulnerability affects only versions 9.7.0-9.7.1, a narrow and very recent release window, which further constrains the exposed population. EPSS data is not available from the provided intelligence, and no KEV listing or public exploit code exists at time of analysis. Real-world risk priority should be moderate for organizations actively running MySQL 9.7.x - particularly those with externally accessible database endpoints or environments where privileged credential compromise is plausible - and low for organizations on earlier MySQL versions. |
| Exploit ScenarioDerived | An attacker who has compromised a high-privileged MySQL account - through credential theft, phishing of a DBA, or lateral movement within an enterprise network - connects to the MySQL Server over any supported protocol and submits a crafted query or operation targeting the JSON Duality component. The request triggers a hang or repeatable crash of the MySQL service, causing a complete denial of service for all downstream applications depending on the database. Because Oracle describes the vulnerability as 'easily exploitable' despite the high privilege requirement, the trigger is likely a simple malformed or edge-case JSON Duality query rather than a complex exploit chain. |
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Alert meAnalysisAIv1 – Jul 22, 2026
Denial of service in Oracle MySQL Server and MySQL Cluster 9.7.0-9.7.1 allows a high-privileged authenticated attacker to cause a complete, repeatable crash or hang of the database service by exploiting a flaw in the Server: JSON Duality component over any supported network protocol. The vulnerability is rated medium severity (CVSS 4.9) due to the high privilege prerequisite, limiting real-world exposure primarily to environments where privileged credentials have been compromised or where insider threat is a concern. No public exploit code has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.
RemediationAI
Oracle has addressed this vulnerability as part of the July 2026 Critical Patch Update; organizations should consult the advisory at https://www.oracle.com/security-alerts/cpujul2026.html to identify the exact patched release version and apply the appropriate update. No specific patched version number beyond 9.7.1 is independently confirmed from the available data, so the CPU advisory is the authoritative source for upgrade targets. As a compensating control prior to patching, restrict network access to MySQL instances to only authorized high-privileged accounts through firewall rules or network segmentation, reducing the attack surface by limiting which hosts can establish privileged database sessions. Additionally, audit and minimize high-privileged MySQL account grants - removing unnecessary DBA-level roles reduces the number of credentials that could be leveraged. If the JSON Duality feature is not operationally required by applications, consider restricting or auditing its use through privilege controls, though disabling it entirely may require application-level changes and should be tested for regression.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
MySQL's JSON Duality feature, introduced in MySQL 8.x and extended through the 9.x release family, allows relational tables to be exposed simultaneously as JSON documents via duality views, bridging structured relational storage with flexible JSON access patterns. The affected component - Server: JSON Duality - processes these dual-representation queries and is exposed to all connected clients with sufficient privilege. The vulnerability exists specifically in MySQL Server 9.7.0-9.7.1 and MySQL Cluster 9.7.0-9.7.1, confirmed by CPE strings cpe:2.3:a:oracle_corporation:mysql_server and cpe:2.3:a:oracle_corporation:mysql_cluster. No CWE is assigned by Oracle, leaving the precise root cause class unspecified; however, the described outcome (hang or frequently repeatable crash) is consistent with unhandled edge cases in JSON parsing or duality view resolution - patterns commonly associated with null pointer dereferences, assertion failures, or resource exhaustion in query processing paths. Multiple protocols are confirmed as viable attack vectors, consistent with MySQL's support for TCP/IP, Unix sockets (where applicable), and named pipe connections.
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Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Network-accessible DoS requiring high-privilege credentials confirms AV:N and PR:H; purely availability impact with no confidentiality or integrity effect justifies C:N/I:N/A:H.
Primary rating from Vendor (oracle).
CVSS VectorVendor: oracle
DescriptionCVE.org
Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: JSON Duality). Supported versions that are affected are MySQL Server: 9.7.0-9.7.1; MySQL Cluster: 9.7.0-9.7.1. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
Threat Intelligence Overview
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
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EUVD-2026-46601
GHSA-xvj5-hp76-xww4
NVD
CVE.org
EPSS
Vulnrichment
Exploit-DB