The Critical Patch Update for April 2018 was released on April 17th, 2018.
Oracle strongly recommends applying the patches as soon as possible.
The Critical Patch Update Advisory is the starting point for relevant information.
It includes the list of products affected, pointers to obtain the patches, a summary of the security vulnerabilities for each product suite, and links to other important documents. Supported products that are not listed in the "Affected Products and Components" section of the advisory do not require new patches to be applied.
Also, it is essential to review the Critical Patch Update supporting documentation
referenced in the Advisory before applying patches, as this is where you can find important pertinent information.
Critical Patch Update Advisories are available at the following location:
Oracle Technology Network: http://www.oracle.com/SecurityAlerts
The Critical Patch Update Advisory for April 2018 is available at the following location:
Oracle Technology Network: http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
Important information can also be found at: https://blogs.oracle.com/security/
The next four dates for Critical Patch Updates are: