# [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>
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