dubbo-2.7.6 is a unknown release. Key changes include:

• Support Service Authentication https://github.com/apache/dubbo/issues/5461;
• Removing the internal JDK API from FileSystemDynamicConfiguration.

dubbo-2.6.8 is a unknown release. Key changes include:

• Please upgrade to the latest version to avoid potential security issues.;
• Vulnerability CVE-2019-17564, Apache Dubbo deserialization vulnerability..