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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction Active

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00279.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Trezor Safe 3 unknown
Version Status Constraints
0 affected < 70c9b0c
70c9b0c unaffected —
Trezor Safe 7 unknown
Version Status Constraints
0 affected < 70c9b0c
70c9b0c unaffected —
Trezor Safe 5 unknown
Version Status Constraints
0 affected < 70c9b0c
70c9b0c unaffected —

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Trezor Subscribe
Safe 3 Subscribe
Safe 5 Subscribe
Safe 7 Subscribe

Project Subscriptions

Vendors Products
Trezor Subscribe
Safe 3 Subscribe
Safe 5 Subscribe
Safe 7 Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/trezor/trezor-firmware/commit/70c9b0c07748 cve-icon cve-icon
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-202-02.json cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-65058 cve-icon cve-icon
History

Thu, 30 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 23 Jul 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Trezor
Trezor safe 3
Trezor safe 5
Trezor safe 7
Vendors & Products Trezor
Trezor safe 3
Trezor safe 5
Trezor safe 7

Tue, 21 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
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.
Title Trezor Safe improper security check in on-device display
Weaknesses CWE-358
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: cisa-cg

Published:

Updated: 2026-07-30T17:29:43.291Z

Reserved: 2026-07-21T14:35:48.323Z

Link: CVE-2026-65058

cve-icon Vulnrichment

Updated: 2026-07-30T17:29:32.650Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-07-21T21:16:54.567

Modified: 2026-07-30T19:18:35.550

Link: CVE-2026-65058

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-30T16:45:04Z

Weaknesses