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

The Persistent Storage on the USB stick will be lost if you install instead of upgrading.

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)

Support and feedback

For support and feedback, visit the Support section on the Tails website.