The last version in the Symfony 2.8 branch have just been released with 2.8.48 with twelve bugfixes related to DoctrineBridge, Translation, BrowserKit, DomCrawler, HttpFoundation, Validator, Form, and Config. If some of your projects are still using this version, consider upgrading as soon as possible to the 3.4 branch for long term support.
Symfony is one of the projects that protects backwards-compatibility very closely, so you find detailed documentation to upgrade your Symfony code. Detailed changelog is available on the Symfony website.
