MSRC-CVE-2026-70585 — Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability

Summary

Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited — Exploitation More Likely. Customer action: Required.

Details

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.

Security updates
10.0.17763.9245 — https://support.microsoft.com/help/5122876
10.0.20348.5622 — https://support.microsoft.com/help/5122882
10.0.26100.33438 — https://support.microsoft.com/help/5122871
10.0.14393.9512 — https://support.microsoft.com/help/5123099
6.2.9200.26349 — https://support.microsoft.com/help/5123065
6.3.9600.23398 — https://support.microsoft.com/help/5123066

Vulnerabilities 1

High 7.0

CVE-2026-70585

Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability

Use after free in Windows Services for NFS ONCRPC XDR Driver allows an authorized attacker to execute code locally.

Microsoft Windows Server 2019 Windows Server 2019 (Server Core installation) Windows Server 2022 Windows

Sep 8, 2026

Revision history

2026-09-08 #1
Information published.

References

CVE-2026-70585 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70585
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss