Is CVE-2026-107817 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-107817 being exploited in the wild.

How severe is CVE-2026-107817?

Medium severity, with a CVSS score of 4.4, published 9 October 2026.

Which products and versions are affected?

MariaDB Server 10.6.1 to 10.6.27, 10.11.0 to 10.11.18, 11.4.0 to 11.4.12, 11.8.0 to 11.8.8, 12.3.0 to 12.3.2, 13.0.0 to 13.0.1.

Is there a fix for CVE-2026-107817?

Yes: fixed in MariaDB Server 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, 13.0.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-107817 attacked?

It is attacked with local access or over the network, in a software library.

Am I affected by CVE-2026-107817?

Check whether you run Mariadb or MariaDB Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-107817: MariaDB mysql_json plugin out-of-bounds read

CVE-2026-107817 · Severity: medium · CVSS 4.4 · Published 2026-10-09

MariaDB is a database server used to store and manage data for applications. The mysql_json plugin, which handles JSON data imported from MySQL tables, fails to validate the data format and can crash the server or leak sensitive information when processing specially crafted invalid JSON. An attacker with the ability to create or modify database tables could exploit this to cause denial of service or extract data.

Technologies: Mariadb, MariaDB Server. Vendors: Mariadb.

Quick answers

Is CVE-2026-107817 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-107817 being exploited in the wild.
How severe is CVE-2026-107817?: Medium severity, with a CVSS score of 4.4, published 9 October 2026.
Which products and versions are affected?: MariaDB Server 10.6.1 to 10.6.27, 10.11.0 to 10.11.18, 11.4.0 to 11.4.12, 11.8.0 to 11.8.8, 12.3.0 to 12.3.2, 13.0.0 to 13.0.1.
Is there a fix for CVE-2026-107817?: Yes: fixed in MariaDB Server 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, 13.0.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-107817 attacked?: It is attacked with local access or over the network, in a software library.
Am I affected by CVE-2026-107817?: Check whether you run Mariadb or MariaDB Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: MariaDB Server 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, 13.0.2

Technical details

The mysql_json plugin in MariaDB assumes imported MySQL tables contain valid binary JSON data without proper validation, leading to out-of-bounds reads when encountering invalid JSON structures. This affects versions 10.6.1 through 10.6.27, 10.11.x before 10.11.19, 11.4.x before 11.4.13, 11.8.x before 11.8.9, 12.3.x before 12.3.3, and 13.0.x before 13.0.2. An attacker with database access can trigger information disclosure or server crashes; exploitation requires the ability to interact with or create specially prepared tables.

Affected products

MariaDB MariaDB Server 10.6.1 to 10.6.27, 10.11.0 to 10.11.18, 11.4.0 to 11.4.12, 11.8.0 to 11.8.8, 12.3.0 to 12.3.2, 13.0.0 to 13.0.1

Timeline

2026-10-09: disclosed

References

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