This release is an emergency release to fix important security vulnerabilities in Tor Browser.

Changes and updates

• Update Tor Browser to 14.5.2, which fixes Mozilla Foundation Security Advisory 2025-37. These vulnerabilities allow an attacker to perform an out-of-bounds read or write on a JavaScript object, but don't allow breaking out of the Firefox sandbox.

• Update Thunderbird to 128.10.1.

• Remove the Tor Browser and Tor Browser (persistent) folders: they are not necessary anymore, thanks to the more flexible confinement of Tor Browser we introduced in Tails 6.14.1. (#15028)

Fixed problems

• Fix the Unsafe Browser appearing in the window list with the Tor Browser icon. (#20934)

• Make reporting an error using WhisperBack more robust. (#20921)

• Fix USB tethering. (#20940)

For more details, read our changelog.

Get Tails 6.15.1

To upgrade your Tails USB stick and keep your Persistent Storage

• Automatic upgrades are available from Tails 6.0 or later to 6.15.1.

• If you cannot do an automatic upgrade or if Tails fails to start after an automatic upgrade, please try to do a manual upgrade.

To install Tails 6.15.1 on a new USB stick

Follow our installation instructions:

• Install from Windows

• Install from macOS

• Install from Linux

• Install from Debian or Ubuntu using the command line and GnuPG

To download only

If you don't need installation or upgrade instructions, you can download Tails 6.15.1 directly:

• For USB sticks (USB image)

• For DVDs and virtual machines (ISO image)