Vulnerability · Published Oct 16, 2026 · Assigned by GitHub_M

CVE-2026-92262MariaDB: Numerous issues caused by historical #mysql50# tablename encoding bypass.

Critical 9.9

In plain English

A critical-severity security flaw in server from MariaDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 73% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)1.5%top 26.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Public PoC

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	mariadb	no fix listed	DEBIAN-CVE-2026-92262
Debian:13	mariadb	no fix listed	DEBIAN-CVE-2026-92262
Debian:14	mariadb	1:11.8.9+ds-1	DEBIAN-CVE-2026-92262
Ubuntu:24.04:LTS	mariadb	no fix listed	UBUNTU-CVE-2026-92262
Ubuntu:26.04:LTS	mariadb	no fix listed	UBUNTU-CVE-2026-92262
Ubuntu:26.10	mariadb	no fix listed	UBUNTU-CVE-2026-92262
Ubuntu:22.04:LTS	mariadb-10.6	no fix listed	UBUNTU-CVE-2026-92262

Affected products (as reported)

Vendor	Product	Versions
MariaDB	server	>= 10.6.1, < 10.6.28>= 10.11.1, < 10.11.19>= 11.4.1, < 11.4.13>= 11.8.1, < 11.8.9>= 12.3.1, < 12.3.3>= 13.0.1, < 13.0.2

Weakness: CWE-706 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

https://github.com/MariaDB/server/security/advisories/GHSA-65jj-h265-3m7h x_refsource_CONFIRM
https://github.com/MariaDB/server/commit/574ba66b2d6c5d71db83d416677876e9b592858e x_refsource_MISC
https://github.com/MariaDB/server/commit/f277eefa424850a8cba5c2371406047f6395e8bb x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-10.6.28 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-11.4.13 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-11.8.9 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3 x_refsource_MISC
https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2 x_refsource_MISC
https://jira.mariadb.org/browse/MDEV-40362 x_refsource_MISC