high CVSS 8.4 EPSS 0.34%

CVE-2026-107818·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 mariadb.service unit used /run/mysqld/wsrep-new-cluster during the next service restart. A database user with FILE privilege and a secure-file-priv configuration permitting writes to /run/mysqld could create that file and inject attacker-controlled environment values into the restarted service. 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
high
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 0.34% — higher than 26% 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.

Read the two together. CVE-2026-107818 scores 8.4 on CVSS, so a successful attack would be serious — but at 0.34%, almost nobody is currently attempting it. That is a different situation from a flaw under mass exploitation, and it is usually the difference between patching on your next maintenance window and patching tonight.

Affected versions

From: 13.0.1

Until: 13.0.2

Fixed in: 13.0.2

How to fix this CVE

Update MariaDB to version 1:11.8.9+ds-1 or later to patch a privilege escalation vulnerability affecting the wsrep cluster initialization process. The vulnerability allows database users with FILE privileges to manipulate service restart behavior by injecting malicious environment values. Ensure your secure-file-priv setting is properly configured and restrict FILE privileges to trusted users only.

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 database version: SELECT VERSION(); and verify it is 1:11.8.9+ds-1 or later
  3. Step 3: Check secure-file-priv setting: SELECT @@secure_file_priv; and verify /run/mysqld is not writable by database users
  4. Step 4: List database users with FILE privilege: SELECT User, Host FROM mysql.user WHERE File_priv='Y'; and audit their necessity
  5. Step 5: Verify no /run/mysqld/wsrep-new-cluster file exists: ls -la /run/mysqld/wsrep* and check file ownership/permissions

FAQ

What is CVE-2026-107818?

This vulnerability allows MariaDB users with FILE privilege to create a specially crafted file in /run/mysqld that gets read during service restart, enabling injection of arbitrary environment variables into the MariaDB service process, potentially leading to privilege escalation or service compromise.

Is CVE-2026-107818 being actively exploited?

No, this CVE is not currently listed in the CISA KEV catalog and no public exploits are available, though the attack requires database-level access and local filesystem manipulation.

What versions of MariaDB are affected by CVE-2026-107818?

Versions from 10.6.1 through 10.6.28 (exclusive), 10.11.19 (exclusive), 11.4.13 (exclusive), 11.8.9 (exclusive), 12.3.3 (exclusive), and 13.0.2 (exclusive) are vulnerable. Fixed versions are 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2 or later.

How do I check if my server is vulnerable to CVE-2026-107818?

Run: mysql -e 'SELECT VERSION();' If the version is below one of the fixed releases listed above AND your secure-file-priv allows writes to /run/mysqld, your server is vulnerable. Additionally check: SELECT @@secure_file_priv;

Does Defensia detect CVE-2026-107818?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If MariaDB is installed on a monitored server, CVE-2026-107818 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

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