2025.12

This release is for Windows only.

This release is based on 2025.10 with the addition of a fix for a BSOD that some users experienced.
Here is a list of all changes since last stable release 2025.11:

Added

• Add helpful warnings when clearing account history. This helps users not lose their account
  numbers.

Windows

• Add additional logging for tunnel devices and split tunneling to problem reports.
• Log WFP sessions when transaction lock timeout occurs.

Changed

• Move placement of login button from inside the account number input to under account number.

Windows

• Implement UDP GSO for QUIC on client socket. This improves download speeds slightly.

Fixed

• Fix version being labeled unsupported unexpectedly. So far, this only an issue when using
  development builds.
• QUIC obfuscation only using one in-address when connecting. It will now randomly select one of
  the available in-addresses for each connection attempt.
• quinn_udp crate flooding mullvad-daemon.log with warnings.

Windows

• Mitigate BSOD caused by split tunnel driver during boot.

Security

Windows

• Block traffic to exit node from non-Mullvad processes. This fixes a leak where traffic could be
  encrypted once, but leave the entry node unencrypted, if and only if the destination were the exit
  node. E.g., this might occur if a browser tries to open a TCP connection to the exit node IP.