Safe 7
Monthly
Ethereum transaction signing on Trezor Safe 3, Safe 5, and Safe 7 hardware wallets can be silently subverted because the device displays and requests on-screen confirmation only for the initial calldata chunk but cryptographically commits the entire streamed calldata into the final signature. A malicious dApp operator or man-in-the-middle attacker can present a benign-looking initial chunk for the victim to approve on the physical device, then stream a manipulated calldata tail that alters the actual transaction semantics - for example changing a token-approval recipient, amount, or contract target. No public exploit has been identified at time of analysis, and the flaw is fixed in upstream commit 70c9b0c per the vendor's firmware repository.
Ethereum transaction signing on Trezor Safe 3, Safe 5, and Safe 7 hardware wallets can be silently subverted because the device displays and requests on-screen confirmation only for the initial calldata chunk but cryptographically commits the entire streamed calldata into the final signature. A malicious dApp operator or man-in-the-middle attacker can present a benign-looking initial chunk for the victim to approve on the physical device, then stream a manipulated calldata tail that alters the actual transaction semantics - for example changing a token-approval recipient, amount, or contract target. No public exploit has been identified at time of analysis, and the flaw is fixed in upstream commit 70c9b0c per the vendor's firmware repository.