CVE-2026-65058
5.3
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Trezor | Safe 3 | 0 < 70c9b0c | affected |
| Trezor | Safe 3 | 70c9b0c | unaffected |
| Trezor | Safe 7 | 0 < 70c9b0c | affected |
| Trezor | Safe 7 | 70c9b0c | unaffected |
| Trezor | Safe 5 | 0 < 70c9b0c | affected |
| Trezor | Safe 5 | 70c9b0c | unaffected |
Weaknesses
- CWE-358: CWE-358 Improperly Implemented Security Check for Standard
References
- https://github.com/trezor/trezor-firmware/commit/70c9b0c07748
- https://www.cve.org/CVERecord?id=CVE-2026-65058
- https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-202-02.json
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