CVE-2009-4030: MySQL

Medium severity, CVSS 4.4. EPSS: 0.4% chance of exploitation in the next 30 days.

MySQL 5.1.x before 5.1.41 allows local users to bypass certain privilege checks by calling CREATE TABLE on a MyISAM table with modified (1) DATA DIRECTORY or (2) INDEX DIRECTORY arguments that are originally associated with pathnames without symlinks, and that can point to tables created at a future time at which a pathname is modified to contain a symlink to a subdirectory of the MySQL data home directory, related to incorrect calculation of the mysql_unpacked_real_data_home value. NOTE: this vulnerability exists because of an incomplete fix for CVE-2008-4098 and CVE-2008-2079.

Affected products

• MySQL MySQL: version 5.1.5 only; version 5.1.23 only; version 5.1.32 only
• Oracle MySQL: version 5.1 only; version 5.1.1 only; version 5.1.2 only; version 5.1.3 only; version 5.1.4 only; version 5.1.6 only; …

Published 2009-11-30. Last modified 2026-06-16.