Tails 5.10 is out (UPDATED)
Dennis Brinkrolf discovered that an adversary who could already run arbitrary code as the amnesia user in Tails 5.9, could have escalated their privileges to reading arbitrary files on the system. It might have been possible to use this as part of an exploit chain to gain root privileges.
UPDATE
From the Tor site:
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New Release: Tails 5.10
For more details, read our changelog.
None specific to this release.