What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-21 · updated 2026-07-30
• Weakness: CWE-358

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

• Trezor Safe 3: before 70c9b0c — fixed in 70c9b0c
• Trezor Safe 5: before 70c9b0c — fixed in 70c9b0c
• Trezor Safe 7: before 70c9b0c — fixed in 70c9b0c

How to fix

Upgrade to a fixed version: Trezor Safe 3 70c9b0c; Trezor Safe 5 70c9b0c; Trezor Safe 7 70c9b0c. Check the vendor advisory for mitigations.

References

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

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