Tails 6.15.1 is out

# [Tails 6.15.1](https://tails.net/news/version_6.15.1/index.en.html)

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

# Changes and updates

  * Update _Tor Browser_ to [14.5.2](https://blog.torproject.org/new-
release-tor-browser-1452), which fixes [Mozilla Foundation Security 
Advisory 2025-37](https://www.mozilla.org/en-
US/security/advisories/mfsa2025-37/). 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](https://blog.mozilla.org/security/2025/05/17/firefox-security-
response-to-pwn2own-2025/).

  * Update _Thunderbird_ to [128.10.1](https://www.thunderbird.net/en-
US/thunderbird/128.10.1esr/releasenotes/).

  * 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](https://tails.net/news/version_6.14.1/index.en.html). 
([#15028](https://gitlab.tails.boum.org/tails/tails/-/issues/15028))

# Fixed problems

  * Fix the _Unsafe Browser_ appearing in the window list with the _Tor 
Browser_ icon. ([#20934](https://gitlab.tails.boum.org/tails/tails/-
/issues/20934))

  * Make reporting an error using _WhisperBack_ more robust. 
([#20921](https://gitlab.tails.boum.org/tails/tails/-/issues/20921))

  * Fix _USB tethering_. 
([#20940](https://gitlab.tails.boum.org/tails/tails/-/issues/20940))

For more details, read our
[changelog](https://gitlab.tails.boum.org/tails/tails/-
/blob/master/debian/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](https://tails.net/doc/upgrade/index.en.html#manual).

## To install Tails 6.15.1 on a new USB stick

Follow our installation instructions:

  * [Install from 
Windows](https://tails.net/install/windows/index.en.html)

  * [Install from macOS](https://tails.net/install/mac/index.en.html)

  * [Install from Linux](https://tails.net/install/linux/index.en.html)

  * [Install from Debian or Ubuntu using the command line and 
GnuPG](https://tails.net/install/expert/index.en.html)

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)](https://tails.net/install/download/index.en.html)

  * [For DVDs and virtual machines (ISO 
image)](https://tails.net/install/download-iso/index.en.html)

URL: <https://tails.net/news/version_6.15.1/index.en.html>