CVE-2026-65058: Trezor Safe 3

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Trezor Safe 3, Safe 5, and Safe 7 firmware contains a confirmation-binding flaw in the Ethereum sign_tx / sign_tx_eip1559 flow. For contract interactions, the device confirms only the initial calldata chunk while the signature commits to the full streamed calldata. An attacker could present calldata to a victim then supply a different tail that changes the signed transaction. Fixed in 70c9b0c.

Affected products

• Trezor Safe 3: before 70c9b0c (fixed in 70c9b0c)
• Trezor Safe 5: before 70c9b0c (fixed in 70c9b0c)
• Trezor Safe 7: before 70c9b0c (fixed in 70c9b0c)

Published 2026-07-21. Last modified 2026-07-30.