trezor.io Trezor Increases Passphrase Limit to 128 Characters Amid Coldcard Attacks
Article Content
- •Trezor has increased passphrase length to 128 characters to enhance security.
- •The change follows July's Coldcard attacks where weak seed phrases were exploited.
- •Users are urged to update their firmware to utilize the new passphrase limit.
Trezor has raised the maximum length of wallet passphrases from 50 to 128 characters in response to the Coldcard attacks in July 2026. These attacks exploited a firmware flaw that allowed attackers to recover weak seed phrases. Trezor noted that users with strong, unique passphrases were able to protect their funds during these incidents. The update is available through the Trezor Suite with the latest firmware, while older versions remain limited to 50 characters. Additionally, Trezor warned users who purchased devices from CryptoBilis about a potential implant that could capture sensitive information. The company has not confirmed any related losses from this issue. Users are advised to update their firmware to take advantage of the new passphrase limit.
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