Quick answers
- Is CVE-2026-70585 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-70585 being exploited in the wild.
- How severe is CVE-2026-70585?
- High severity, with a CVSS score of 7, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Services for NFS.
- Is there a fix for CVE-2026-70585?
- 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-2026-70585 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-70585?
- Check whether you run Microsoft Windows Services for NFS. 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
The vulnerability is a use-after-free flaw in the ONCRPC XDR (eXternal Data Representation) driver component of Windows Services for NFS. The vulnerability requires authentication and local access to exploit; an authorized user can trigger the use-after-free condition through specially crafted NFS protocol interactions, leading to arbitrary code execution in kernel context. The root cause involves improper memory management when handling XDR data structures. An attacker with local system access can leverage this to gain kernel-level code execution and bypass security boundaries. Microsoft has released security updates to address this issue through their standard patch cycle.
Affected products
- Microsoft Windows Services for NFS
Timeline
- 2026-09-08: disclosed