CVE-2026-65058

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

Safe 3, Safe 5, Safe 7, Trezor-Firmware

Fix

Available

CVSS 4.0

5.9 MEDIUM

CVSS 3.1

5.3 MEDIUM

EPSS

0.3% (20th percentile)

Weakness

CWE-358

NVD status

Awaiting Analysis

Published

2026-07-21