Fixed in Apache Tomcat 8.5.9

Important: Information Disclosure CVE-2016-8745

A bug in the error handling of the send file code for the NIO HTTP connector resulted in the current Processor object being added to the Processor cache multiple times. This in turn meant that the same Processor could be used for concurrent requests. Sharing a Processor can result in information leakage between requests including, but not limited to, session ID and the response body.

This was fixed in revision 1771857.

This issue was identified by the Apache Tomcat Security Team on 8 December 2016 and made public on 12 December 2016.

Affects: 8.5.0 to 8.5.8