MSRC_CVE-2026-78445
Vulnerability from csaf_microsoft - Published: 2026-09-08 07:00 - Updated: 2026-09-08 07:00Summary
Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
9.8 (Critical)
Affected products
Fixed
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2019 10.0.17763.9245
Microsoft / Windows Server 2019
|
10.0.17763.9245 | ||
|
Windows Server 2019 (Server Core installation) 10.0.17763.9245
Microsoft / Windows Server 2019 (Server Core installation)
|
10.0.17763.9245 | ||
|
Windows Server 2022 10.0.20348.5622
Microsoft / Windows Server 2022
|
10.0.20348.5622 | ||
|
Windows Server 2022 (Server Core installation) 10.0.20348.5622
Microsoft / Windows Server 2022 (Server Core installation)
|
10.0.20348.5622 | ||
|
Windows Server 2025 (Server Core installation) 10.0.26100.33438
Microsoft / Windows Server 2025 (Server Core installation)
|
10.0.26100.33438 | ||
|
Windows Server 2025 10.0.26100.33438
Microsoft / Windows Server 2025
|
10.0.26100.33438 | ||
|
Windows Server 2016 10.0.14393.9512
Microsoft / Windows Server 2016
|
10.0.14393.9512 | ||
|
Windows Server 2016 (Server Core installation) 10.0.14393.9512
Microsoft / Windows Server 2016 (Server Core installation)
|
10.0.14393.9512 | ||
|
Windows Server 2012 6.2.9200.26349
Microsoft / Windows Server 2012
|
6.2.9200.26349 | ||
|
Windows Server 2012 (Server Core installation) 6.2.9200.26349
Microsoft / Windows Server 2012 (Server Core installation)
|
6.2.9200.26349 | ||
|
Windows Server 2012 R2 6.3.9600.23398
Microsoft / Windows Server 2012 R2
|
6.3.9600.23398 | ||
|
Windows Server 2012 R2 (Server Core installation) 6.3.9600.23398
Microsoft / Windows Server 2012 R2 (Server Core installation)
|
6.3.9600.23398 |
Known affected
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2019 <10.0.17763.9245
Microsoft / Windows Server 2019
|
<10.0.17763.9245 |
Vendor Fix
fix
|
|
|
Windows Server 2019 (Server Core installation) <10.0.17763.9245
Microsoft / Windows Server 2019 (Server Core installation)
|
<10.0.17763.9245 |
Vendor Fix
fix
|
|
|
Windows Server 2022 <10.0.20348.5622
Microsoft / Windows Server 2022
|
<10.0.20348.5622 |
Vendor Fix
fix
|
|
|
Windows Server 2022 (Server Core installation) <10.0.20348.5622
Microsoft / Windows Server 2022 (Server Core installation)
|
<10.0.20348.5622 |
Vendor Fix
fix
|
|
|
Windows Server 2025 (Server Core installation) <10.0.26100.33438
Microsoft / Windows Server 2025 (Server Core installation)
|
<10.0.26100.33438 |
Vendor Fix
fix
|
|
|
Windows Server 2025 <10.0.26100.33438
Microsoft / Windows Server 2025
|
<10.0.26100.33438 |
Vendor Fix
fix
|
|
|
Windows Server 2016 <10.0.14393.9512
Microsoft / Windows Server 2016
|
<10.0.14393.9512 |
Vendor Fix
fix
|
|
|
Windows Server 2016 (Server Core installation) <10.0.14393.9512
Microsoft / Windows Server 2016 (Server Core installation)
|
<10.0.14393.9512 |
Vendor Fix
fix
|
|
|
Windows Server 2012 <6.2.9200.26349
Microsoft / Windows Server 2012
|
<6.2.9200.26349 |
Vendor Fix
fix
|
|
|
Windows Server 2012 (Server Core installation) <6.2.9200.26349
Microsoft / Windows Server 2012 (Server Core installation)
|
<6.2.9200.26349 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 <6.3.9600.23398
Microsoft / Windows Server 2012 R2
|
<6.3.9600.23398 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 (Server Core installation) <6.3.9600.23398
Microsoft / Windows Server 2012 R2 (Server Core installation)
|
<6.3.9600.23398 |
Vendor Fix
fix
|
References
4 references
| URL | Category |
|---|---|
| https://msrc.microsoft.com/csaf/vex/2026/msrc_cve… | self |
| https://support.microsoft.com/lifecycle | external |
| https://www.first.org/cvss | external |
| https://msrc.microsoft.com/csaf/vex/2026/msrc_cve… | self |
{
"document": {
"category": "csaf_vex",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2026-78445 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-78445.json"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability",
"tracking": {
"current_release_date": "2026-09-08T07:00:00.000Z",
"generator": {
"date": "2026-10-01T22:52:25.118Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-78445",
"initial_release_date": "2026-09-08T07:00:00.000Z",
"revision_history": [
{
"date": "2026-09-08T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.17763.9245",
"product": {
"name": "Windows Server 2019 \u003c10.0.17763.9245",
"product_id": "6"
}
},
{
"category": "product_version",
"name": "10.0.17763.9245",
"product": {
"name": "Windows Server 2019 10.0.17763.9245",
"product_id": "11571"
}
}
],
"category": "product_name",
"name": "Windows Server 2019"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.17763.9245",
"product": {
"name": "Windows Server 2019 (Server Core installation) \u003c10.0.17763.9245",
"product_id": "5"
}
},
{
"category": "product_version",
"name": "10.0.17763.9245",
"product": {
"name": "Windows Server 2019 (Server Core installation) 10.0.17763.9245",
"product_id": "11572"
}
}
],
"category": "product_name",
"name": "Windows Server 2019 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.20348.5622",
"product": {
"name": "Windows Server 2022 \u003c10.0.20348.5622",
"product_id": "4"
}
},
{
"category": "product_version",
"name": "10.0.20348.5622",
"product": {
"name": "Windows Server 2022 10.0.20348.5622",
"product_id": "11923"
}
}
],
"category": "product_name",
"name": "Windows Server 2022"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.20348.5622",
"product": {
"name": "Windows Server 2022 (Server Core installation) \u003c10.0.20348.5622",
"product_id": "3"
}
},
{
"category": "product_version",
"name": "10.0.20348.5622",
"product": {
"name": "Windows Server 2022 (Server Core installation) 10.0.20348.5622",
"product_id": "11924"
}
}
],
"category": "product_name",
"name": "Windows Server 2022 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.33438",
"product": {
"name": "Windows Server 2025 (Server Core installation) \u003c10.0.26100.33438",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "10.0.26100.33438",
"product": {
"name": "Windows Server 2025 (Server Core installation) 10.0.26100.33438",
"product_id": "12437"
}
}
],
"category": "product_name",
"name": "Windows Server 2025 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.33438",
"product": {
"name": "Windows Server 2025 \u003c10.0.26100.33438",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "10.0.26100.33438",
"product": {
"name": "Windows Server 2025 10.0.26100.33438",
"product_id": "12436"
}
}
],
"category": "product_name",
"name": "Windows Server 2025"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.14393.9512",
"product": {
"name": "Windows Server 2016 \u003c10.0.14393.9512",
"product_id": "8"
}
},
{
"category": "product_version",
"name": "10.0.14393.9512",
"product": {
"name": "Windows Server 2016 10.0.14393.9512",
"product_id": "10816"
}
}
],
"category": "product_name",
"name": "Windows Server 2016"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.14393.9512",
"product": {
"name": "Windows Server 2016 (Server Core installation) \u003c10.0.14393.9512",
"product_id": "7"
}
},
{
"category": "product_version",
"name": "10.0.14393.9512",
"product": {
"name": "Windows Server 2016 (Server Core installation) 10.0.14393.9512",
"product_id": "10855"
}
}
],
"category": "product_name",
"name": "Windows Server 2016 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c6.2.9200.26349",
"product": {
"name": "Windows Server 2012 \u003c6.2.9200.26349",
"product_id": "12"
}
},
{
"category": "product_version",
"name": "6.2.9200.26349",
"product": {
"name": "Windows Server 2012 6.2.9200.26349",
"product_id": "10378"
}
}
],
"category": "product_name",
"name": "Windows Server 2012"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c6.2.9200.26349",
"product": {
"name": "Windows Server 2012 (Server Core installation) \u003c6.2.9200.26349",
"product_id": "11"
}
},
{
"category": "product_version",
"name": "6.2.9200.26349",
"product": {
"name": "Windows Server 2012 (Server Core installation) 6.2.9200.26349",
"product_id": "10379"
}
}
],
"category": "product_name",
"name": "Windows Server 2012 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c6.3.9600.23398",
"product": {
"name": "Windows Server 2012 R2 \u003c6.3.9600.23398",
"product_id": "10"
}
},
{
"category": "product_version",
"name": "6.3.9600.23398",
"product": {
"name": "Windows Server 2012 R2 6.3.9600.23398",
"product_id": "10483"
}
}
],
"category": "product_name",
"name": "Windows Server 2012 R2"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c6.3.9600.23398",
"product": {
"name": "Windows Server 2012 R2 (Server Core installation) \u003c6.3.9600.23398",
"product_id": "9"
}
},
{
"category": "product_version",
"name": "6.3.9600.23398",
"product": {
"name": "Windows Server 2012 R2 (Server Core installation) 6.3.9600.23398",
"product_id": "10543"
}
}
],
"category": "product_name",
"name": "Windows Server 2012 R2 (Server Core installation)"
}
],
"category": "vendor",
"name": "Microsoft"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-78445",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
}
],
"product_status": {
"fixed": [
"11571",
"11572",
"11923",
"11924",
"12437",
"12436",
"10816",
"10855",
"10378",
"10379",
"10483",
"10543"
],
"known_affected": [
"6",
"5",
"4",
"3",
"1",
"2",
"8",
"7",
"12",
"11",
"10",
"9"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-78445 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-78445.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "10.0.17763.9245:Security Update:https://support.microsoft.com/help/5122876",
"product_ids": [
"6",
"5"
],
"url": "https://support.microsoft.com/help/5122876"
},
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "10.0.20348.5622:Security Update:https://support.microsoft.com/help/5122882",
"product_ids": [
"4",
"3"
],
"url": "https://support.microsoft.com/help/5122882"
},
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "10.0.26100.33438:Security Update:https://support.microsoft.com/help/5122871",
"product_ids": [
"1",
"2"
],
"url": "https://support.microsoft.com/help/5122871"
},
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "10.0.14393.9512:Security Update:https://support.microsoft.com/help/5123099",
"product_ids": [
"8",
"7"
],
"url": "https://support.microsoft.com/help/5123099"
},
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "6.2.9200.26349:Monthly Rollup:https://support.microsoft.com/help/5123065",
"product_ids": [
"12",
"11"
],
"url": "https://support.microsoft.com/help/5123065"
},
{
"category": "vendor_fix",
"date": "2026-09-08T07:00:00.000Z",
"details": "6.3.9600.23398:Monthly Rollup:https://support.microsoft.com/help/5123066",
"product_ids": [
"10",
"9"
],
"url": "https://support.microsoft.com/help/5123066"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 8.5,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12"
]
}
],
"title": "Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability"
}
]
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…