MySQL is a popular multi-threaded, multi-user SQL server.
Joe Gallo and Artem Russakovskii reported an error in the convert_search_mode_to_innobase() function in ha_innodb.cc in the InnoDB engine that is leading to a failed assertion when handling CONTAINS operations.
A remote authenticated attacker with ALTER privileges could send a specially crafted request to a vulnerable database server possibly leading to a Denial of Service.
There is no known workaround at this time.
All MySQL users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-db/mysql-5.0.44-r2"