CVE-2026-65058

MEDIUM 5.3

Trezor Safe improper security check in on-device display

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-358
Vendor	trezor
Product	safe 3
Published	Jul 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

Trezor / Safe 3

0 < 70c9b0c

Trezor / Safe 7

0 < 70c9b0c

Trezor / Safe 5

0 < 70c9b0c

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Oleh Konko, 1seal