csaf_cisa_it:va-26-202-02
MEDIUM CVSS 5.3 csaf_cisa_it
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.
Timeline
- Published
- 2026-07-21 14:39 UTC
- Last Modified
- 2026-07-21
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
References
No references available.
Linked Vulnerabilities
No linked vulnerabilities found.
{
"document": {
"category": "csaf_vex",
"csaf_version": "2.0",
"distribution": {
"tlp": {
"label": "WHITE"
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},
"lang": "en-US",
"notes": [
{
"category": "legal_disclaimer",
"text": "All information products included in [https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white](https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white) are provided \\\"as is\\\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see [https://us-cert.cisa.gov/tlp/](https://us-cert.cisa.gov/tlp/).",
"title": "Legal Notice"
},
{
"category": "other",
"text": "Worldwide",
"title": "Countries and Areas Deployed"
},
{
"category": "other",
"text": "Information Technology",
"title": "Critical Infrastructure Sectors"
},
{
"category": "summary",
"text": "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.",
"title": "Risk Evaluation"
},
{
"category": "general",
"text": "Fixed in 70c9b0c.",
"title": "Recommended Practices"
},
{
"category": "other",
"text": "United States",
"title": "Company Headquarters Location"
}
],
"publisher": {
"category": "coordinator",
"contact_details": "https://www.cisa.gov/report",
"issuing_authority": "CISA",
"name": "CISA",
"namespace": "https://www.cisa.gov/"
},
"references": [
{
"category": "self",
"summary": "Vulnerability Advisory VA-26-202-02 CSAF",
"url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-202-02.json"
}
],
"title": "Trezor Safe improper security check in on-device display",
"tracking": {
"current_release_date": "2026-07-21T14:39:13Z",
"generator": {
"engine": {
"name": "VINCE-NT",
"version": "1.15.0+build.101"
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},
"id": "VA-26-202-02",
"initial_release_date": "2026-07-21T14:39:13Z",
"revision_history": [
{
"date": "2026-07-21T14:39:13Z",
"number": "1.0.0",
"summary": "Initial publication"
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],
"status": "final",
"version": "1.0.0"
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},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "<70c9b0c",
"product": {
"name": "Trezor Safe 3 <70c9b0c",
"product_id": "CSAFPID-0001"
}
},
{
"category": "product_version",
"name": "70c9b0c",
"product": {
"name": "Trezor Safe 3 70c9b0c",
"product_id": "CSAFPID-0002"
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}
],
"category": "product_name",
"name": "Safe 3"
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{
"branches": [
{
"category": "product_version_range",
"name": "<70c9b0c",
"product": {
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{
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"name": "70c9b0c",
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"product_id": "CSAFPID-0004"
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],
"category": "product_name",
"name": "Safe 5"
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{
"branches": [
{
"category": "product_version_range",
"name": "<70c9b0c",
"product": {
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"product_id": "CSAFPID-0005"
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},
{
"category": "product_version",
"name": "70c9b0c",
"product": {
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"product_id": "CSAFPID-0006"
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],
"category": "product_name",
"name": "Safe 7"
}
],
"category": "vendor",
"name": "Trezor"
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]
},
"vulnerabilities": [
{
"acknowledgments": [
{
"names": [
" Oleh Konko"
],
"organization": "1seal"
}
],
"cve": "CVE-2026-65058",
"cwe": {
"id": "CWE-358",
"name": "Improperly Implemented Security Check for Standard"
},
"notes": [
{
"category": "summary",
"text": "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": "Description"
},
{
"category": "details",
"text": "SSVCv2/E:N/A:N/T:P/2026-06-30T18:42:58Z/",
"title": "SSVC"
}
],
"product_status": {
"fixed": [
"CSAFPID-0002",
"CSAFPID-0006",
"CSAFPID-0004"
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"known_affected": [
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"CSAFPID-0005",
"CSAFPID-0003"
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"references": [
{
"category": "external",
"summary": "github.com",
"url": "https://github.com/trezor/trezor-firmware/commit/70c9b0c07748"
},
{
"category": "external",
"summary": "CVE-2026-65058",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-65058"
},
{
"category": "external",
"summary": "VA-26-202-02 CSAF",
"url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-202-02.json"
}
],
"release_date": "2026-03-19T00:00:00Z",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-19T00:00:00Z",
"details": "Fixed in 70c9b0c.",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://github.com/trezor/trezor-firmware/commit/70c9b0c07748"
},
{
"category": "vendor_fix",
"date": "2026-03-19T00:00:00Z",
"details": "Fixed in 70c9b0c.",
"product_ids": [
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"url": "https://github.com/trezor/trezor-firmware/commit/70c9b0c07748"
},
{
"category": "vendor_fix",
"date": "2026-03-19T00:00:00Z",
"details": "Fixed in 70c9b0c.",
"product_ids": [
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"url": "https://github.com/trezor/trezor-firmware/commit/70c9b0c07748"
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{
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{
"category": "vendor_fix",
"date": "2026-03-19T00:00:00Z",
"details": "Fixed in 70c9b0c.",
"product_ids": [
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{
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"date": "2026-03-19T00:00:00Z",
"details": "Fixed in 70c9b0c.",
"product_ids": [
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"url": "https://github.com/trezor/trezor-firmware/commit/70c9b0c07748"
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],
"scores": [
{
"cvss_v3": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"CSAFPID-0001",
"CSAFPID-0005",
"CSAFPID-0003"
]
}
],
"title": "Trezor Safe improper security check in on-device display"
}
]
}