medium CVSS 6.4 EPSS 0.31%

CVE-2026-107816·MariaDB vulnerability

MariaDB server is a community developed fork of MySQL server. From 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, the qc_info plugin could be confused by a query containing embedded null bytes. Reading information_schema.query_cache_info after such a query was cached could access data beyond the end of a heap-allocated buffer, potentially disclosing adjacent memory or crashing the server. This issue is fixed in versions 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2.

Severity
medium
Software
MariaDB
Fixed in
13.0.2
Published

How likely is exploitation

FIRST's Exploit Prediction Scoring System puts the probability of this CVE being exploited in the next 30 days at 0.31% — higher than 22% of all published CVEs. EPSS is an independent forecast of exploitation, not a severity rating: it says nothing about how much damage a successful attack does, which is what a CVSS score measures.

Affected versions

From: 13.0.1

Until: 13.0.2

Fixed in: 13.0.2

How to fix this CVE

Update MariaDB server to version 11.8.9 or later to patch a memory disclosure vulnerability in the query cache info plugin. The vulnerability allows attackers with database access to read adjacent heap memory or crash the server by executing queries with embedded null bytes. Immediate patching is recommended for all affected MariaDB installations.

sudo dnf update mariadb-server

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check installed MariaDB version with: mysql --version or mariadb --version
  2. Step 2: Query the server for exact version: SELECT VERSION(); — confirm if it is below 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, or 13.0.2
  3. Step 3: Verify if the qc_info plugin is enabled by querying: SELECT * FROM information_schema.plugins WHERE PLUGIN_NAME='query_cache_info';
  4. Step 4: After patching, re-run mysql --version and SELECT VERSION(); to confirm the fix was applied

FAQ

What is CVE-2026-107816?

This vulnerability affects MariaDB's query cache info plugin, which can be bypassed using null byte injection in SQL queries. When the cached query is subsequently read from information_schema.query_cache_info, an out-of-bounds heap read occurs, potentially exposing sensitive memory or causing a denial of service.

Is CVE-2026-107816 being actively exploited?

No, there is currently no public exploit available for CVE-2026-107816, and it is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog as of this advisory.

What versions of MariaDB are affected by CVE-2026-107816?

Affected versions include 10.6.1 through 10.6.27, 10.11.x through 10.11.18, 11.4.x through 11.4.12, 11.8.x through 11.8.8, 12.3.x through 12.3.2, and 13.0.x through 13.0.1. All versions from 10.6.1 onward are potentially vulnerable.

How do I check if my server is vulnerable to CVE-2026-107816?

Run 'mariadb --version' and check if the version is below the fixed versions (10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, or 13.0.2). Additionally, verify the qc_info plugin is loaded with: SELECT * FROM information_schema.plugins WHERE PLUGIN_NAME='query_cache_info';

Does Defensia detect CVE-2026-107816?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If MariaDB is installed on a monitored server, CVE-2026-107816 will appear in your dashboard with remediation steps.

Related MariaDB CVEs

CVE-2026-49261CVSS 10MariaDB server is a community developed fork of MySQL server. Versions 10.6.1 through 10.6.26, 10.11.1 through 10.11.17, 11.4.1 through 11.4.11, 11.8.1 through 11.8.7, and 12.3.1 with `wsrep_notify_cmd` enabled would execute shell commands embedded in the name of the joiner node. This is fixed in 10.6.27, 10.11.18, 11.4.12, 11.8.8, and 12.3.2. As a workaround, anyone who cannot upgrade now should disable `wsrep_notify_cmd`.
CVE-2026-85748CVSS 9.9MariaDB server is a community developed fork of MySQL server. From 12.3.1 until 12.3.3 and 13.0.2, SYS_REFCURSOR handling is affected because cursor-array reallocation can leave stale references in routine contexts. A low-privileged attacker can open a large number of SYS_REFCURSORs and then fetch one to trigger a use-after-free that can enable remote code execution when combined with another vulnerability. This issue is fixed in versions 12.3.3 and 13.0.2.
CVE-2026-85746CVSS 9.9MariaDB server is a community developed fork of MySQL server. From 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, ST_AsText can write beyond an allocated output buffer when converting deeply nested GeometryCollections because recursive WKT serialization does not account for bytes consumed or reserve sufficient space. A low-privileged remote attacker can submit a specially crafted GIS object to corrupt memory and potentially achieve code execution when combined with another vulnerability. This issue is fixed in versions 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2.
CVE-2026-92262CVSS 9.9MariaDB server is a community developed fork of MySQL server. From 10.6.1 until 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, the #mysql50# bypass prefix is affected because it allows the #mysql50# prefix to bypass normal table-name filesystem encoding. An attacker can trigger the issue with a table name using the #mysql50# prefix, then use a #mysql50# table name to access files under their legacy unencoded name and cause crashes, data corruption, data exfiltration, or remote code execution. This issue is fixed in versions 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2.
CVE-2026-44170CVSS 9.8MariaDB server is a community developed fork of MySQL server. From versions 10.6.1 to before 10.6.26, 10.11.1 to before 10.11.17, 11.4.1 to before 11.4.11, 11.8.1 to before 11.8.7, and 12.3.1, MariaDB on WIndows with installed CONNECT engine and enabled REST support interpolated table HTTP attribute into the curl command line without proper sanitizing. This allows the user to execute shell commands on the server. This issue has been patched in versions 10.6.26, 10.11.17, 11.4.11, 11.8.7, and 12.3.2.

References

Track CVEs across your fleet automatically

Defensia scans your Linux servers and tells you exactly which ones are running vulnerable versions — including CVE-2026-107816. Free for 1 server.

Get started free