critical CVSS 9.9 EPSS 0.68%

CVE-2026-92262·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 #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.

Severity
critical
Software
MariaDB
Fixed in
12.3.3
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 0.68% — higher than 51% 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-2026-92262 scores 9.9 on CVSS, so a successful attack would be serious — but at 0.68%, 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: 12.3.1

Until: 12.3.3

Fixed in: 12.3.3

How to fix this CVE

MariaDB versions prior to 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2 are vulnerable to a table-name encoding bypass attack via the #mysql50# prefix that can lead to file access, data corruption, and remote code execution. Immediately update MariaDB to version 11.8.9+ds-1 or later to patch this critical vulnerability. After upgrading, restart the MariaDB service and validate that legacy #mysql50# prefixed tables are properly encoded.

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 MariaDB instance for any tables using the #mysql50# prefix: SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_NAME LIKE '%#mysql50#%';
  3. Step 3: Search MariaDB error logs for table access anomalies or crashes: grep -i '#mysql50#' /var/log/mysql/error.log or journalctl -u mariadb | grep -i error
  4. Step 4: Verify the patch was applied by confirming the version matches 11.8.9+ds-1 or later: mariadb --version | grep -E '(10\.6\.28|10\.11\.19|11\.4\.13|11\.8\.9|12\.3\.3|13\.0\.2)'

FAQ

What is CVE-2026-92262?

CVE-2026-92262 is a critical bypass vulnerability in MariaDB that exploits the #mysql50# compatibility prefix to circumvent filename encoding restrictions, allowing attackers to access unencoded table files and execute arbitrary operations including remote code execution.

Is CVE-2026-92262 being actively exploited?

No, CVE-2026-92262 is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog and no public exploits are currently available, though the critical severity warrants immediate patching as proof-of-concept code may emerge.

What versions of MariaDB are affected by CVE-2026-92262?

Vulnerable versions include 10.6.1 through 10.6.27, 10.11.0 through 10.11.18, 11.4.0 through 11.4.12, 11.8.0 through 11.8.8, 12.3.0 through 12.3.2, and 13.0.0 through 13.0.1. All versions are fixed in 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2 respectively.

How do I check if my server is vulnerable to CVE-2026-92262?

Run 'mariadb --version' and compare the output against the affected version ranges. If your version falls between any of the vulnerable ranges (e.g., 11.8.0-11.8.8), your server is vulnerable and requires immediate upgrade.

Does Defensia detect CVE-2026-92262?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If MariaDB is installed on a monitored server, CVE-2026-92262 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-2026-44170CVSS 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.
CVE-2026-22730CVSS 8.8A critical SQL injection vulnerability in Spring AI's MariaDBFilterExpressionConverter allows attackers to bypass metadata-based access controls and execute arbitrary SQL commands. The vulnerability exists due to missing input sanitization.

References

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