While reading the rewritten security chapter I came acrosshttps://github.com/symfony/symfony-docs/blob/2.3/book/security.rst#checking-for-known-security-vulnerabilities-in-dependencies

IMO this part should be moved somewhere else (however I don't know where yet), since there is thematically no analogy to the rest of the chapter. Everything is about Symfony's security system as the first three words are telling, but this is about security vulnerabilities in dependencies.