CVE-2026-69595: Microsoft Windows Services for NFS ONCRPC XDR Driver use after free

CVE-2026-69595 · Severity: critical · CVSS 9.8 · Published 2026-09-08

Windows Services for NFS is a Windows component that enables network file sharing using the NFS protocol. A use-after-free vulnerability in the ONCRPC XDR driver allows an attacker to execute arbitrary code remotely over the network without requiring authentication, potentially compromising the entire system.

Technologies: Microsoft Windows Services for NFS. Vendors: Microsoft.

Quick answers

Is CVE-2026-69595 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-69595 being exploited in the wild.
How severe is CVE-2026-69595?
Critical severity, with a CVSS score of 9.8, published 8 September 2026.
Which products and versions are affected?
Microsoft Windows Services for NFS <UNKNOWN>.
Is there a fix for CVE-2026-69595?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-69595 attacked?
It is attacked over the network.
Am I affected by CVE-2026-69595?
Check whether you run Microsoft Windows Services for NFS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A use-after-free vulnerability exists in the Windows Services for NFS ONCRPC XDR Driver, which handles data serialization/deserialization for NFS network communication. The vulnerability is remotely exploitable over the network without authentication requirements. An attacker can craft a malicious NFS request that triggers memory mismanagement, allowing code execution with the privileges of the NFS service. The network-reachable attack vector combined with lack of authentication requirements creates a high-impact remote code execution risk.

Affected products

  • Microsoft Windows Services for NFS <UNKNOWN>

Timeline

  • 2026-09-08: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.