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CVE-2026-47012 Oracle Corporation CVE debrief

A vulnerability was discovered in the MySQL Server and MySQL Cluster products of Oracle MySQL, specifically in the Server: Optimizer component. The affected versions are MySQL Server: 8.4.0-8.4.10, 9.7.0-9.7.1; MySQL Cluster: 8.0.0-8.0.47, 8.4.0-8.4.10, and 9.7.0-9.7.1. This difficult-to-exploit vulnerability allows a high-privileged attacker with network access via multiple protocols to compromise MySQL Server and MySQL Cluster. Successful attacks can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server and MySQL Cluster. The vulnerability has a CVSS 3.1 Base Score of 4.4 (Availability impacts) and a CVSS Vector of (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H).

Vendor
Oracle Corporation
Product
MySQL Server
CVSS
MEDIUM 4.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-21
Original CVE updated
2026-07-27
Advisory published
2026-07-21
Advisory updated
2026-07-27

Who should care

Administrators and users of MySQL Server and MySQL Cluster versions 8.4.0-8.4.10, 9.7.0-9.7.1, and 8.0.0-8.0.47 should be aware of this vulnerability and take necessary actions to mitigate the risk. This includes reviewing the vendor advisory, applying patches, restricting network access, and monitoring for unusual activity.

Technical summary

The vulnerability has a CVSS 3.1 Base Score of 4.4 (Availability impacts) and a CVSS Vector of (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H). The vulnerability is classified under CWE-400. Oracle has provided a vendor advisory for this issue. This vulnerability affects MySQL Server versions 8.4.0-8.4.10 and 9.7.0-9.7.1, as well as MySQL Cluster versions 8.0.0-8.0.47, 8.4.0-8.4.10, and 9.7.0-9.7.1. The vulnerability allows a high-privileged attacker with network access via multiple protocols to compromise MySQL Server and MySQL Cluster, potentially leading to a complete DOS.

Defensive priority

Medium priority should be given to patching this vulnerability, as it can lead to a complete DOS of MySQL Server and MySQL Cluster.

Recommended defensive actions

  • Apply the patches provided by Oracle as soon as possible
  • Restrict network access to MySQL Server and MySQL Cluster to only necessary personnel
  • Monitor MySQL Server and MySQL Cluster for unusual activity
  • Consider implementing compensating controls, such as Web Application Firewalls
  • Inventory and verify the versions of MySQL Server and MySQL Cluster in use
  • Review and implement Oracle's vendor advisory
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record was published on 2026-07-21T22:17:06.740Z and was last modified on 2026-07-27T14:53:35.210Z. The NVD entry is currently Analyzed. This information is based on the NVD entry and the CVE record. Defenders should verify the affected versions of MySQL Server and MySQL Cluster and review the vendor advisory for mitigation strategies.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47012 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47012

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47012 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47012

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.