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Test your applicationsUpgrade RHEL:7 mariadb-libs to version 1:5.5.41-2.el7_0 or higher.
This issue was patched in RHSA-2015:0118.
Note: Versions mentioned in the description apply only to the upstream mariadb-libs package and not the mariadb-libs package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
Unspecified vulnerability in Oracle MySQL Server 5.5.40 and earlier allows remote authenticated users to affect availability via vectors related to Server : InnoDB : DDL : Foreign Key.