Vulnerability · Published Jul 21, 2026 · Assigned by cisa-cg

CVE-2026-65058Trezor Safe improper security check in on-device display

Medium 5.3

In plain English

A medium-severity security flaw in Safe 3 from Trezor. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 65.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
Trezor	Safe 3	0 – before 70c9b0c
Trezor	Safe 7	0 – before 70c9b0c
Trezor	Safe 5	0 – before 70c9b0c

Weakness: CWE-358 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

References

url patch
url vdb-entry
url third-party-advisory