Today seems to be the day of the security patch. The Java Runtime Environment has received an update to JRE 6 Update 19 which fixes several security vulnerabilities. Users who have Java installed on their computer systems are encouraged to update to the latest version immediately to fix the security issues.
The changelog lists all the bug fixes of the latest version including changes to root certificates, an interim fix for the Transport Layer Security (TLS) Man-in-the-Middle Attack and the raising of a warning dialog if a signed application contains signed and unsigned components.
All the changes and fixes including links to further information can be accessed at the changelog page.
Users can visit the JRE download page to test their version of the Java Runtime Environment to evaluate if an update is necessary.

Users with outdated versions of the JRE can download it immediately from the download page for their operating system. The Java Runtime Environment is offered as an offline and online installer for Windows on the standard download page.
It is recommended to check the verify Java page again after the update to make sure it was applied successfully.
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