Symfony 4.2.12 released

Symfony 4.2.12 has just been released. Here is a list of the most important changes:

  • security #cve-2019-18886 [SecurityCore] throw AccessDeniedException when switch user fails (@nicolas-grekas)
  • security #cve-2019-18889 [Cache] forbid serializing AbstractAdapter and TagAwareAdapter instances (@nicolas-grekas)
  • security #cve-2019-11325 [VarExporter] fix exporting some strings (@nicolas-grekas)
  • security #cve-2019-18888 [HttpFoundation] fix guessing mime-types of files with leading dash (@nicolas-grekas)
  • security #cve-2019-18887 [HttpKernel] Use constant time comparison in UriSigner (@stof)

Want to upgrade to this new release? Fortunately, because Symfony protects backwards-compatibility very closely, this should be quite easy. Read our upgrade documentation to learn more.

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