Vulnerability in Trezor Safe 3
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.
EPSS: 0.004 (33.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.
Affected products
- Trezor Safe 3 — versions 0, 70c9b0c
- Trezor Safe 5 — versions 0, 70c9b0c
- Trezor Safe 7 — versions 0, 70c9b0c
Weakness classification (CWE)
Public proof-of-concept exploits
References
- 9119a7d8-5eab-497f-8521-727c672e3725 (patch)
- 9119a7d8-5eab-497f-8521-727c672e3725 (vdb-entry)
- 9119a7d8-5eab-497f-8521-727c672e3725 (third-party-advisory)
Frequently asked questions
- What is CVE-2026-65058?
- CVE-2026-65058 is a medium-severity vulnerability in Trezor Safe 3, classified under CWE-358. CVSS score: 5.3/10. Published 2026-07-21.
- How severe is CVE-2026-65058?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2026-65058 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.