# CVE-2026-69940: Windows Client for NFS out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-69940-out-of-bounds-read-in-windows-client-for-nfs-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-69940 · Severity: medium · CVSS 6.5 · Published 2026-10-13

Windows Client for NFS is a component that enables Windows systems to access files on Network File System (NFS) servers, commonly used in mixed Windows and Unix environments. An out-of-bounds read vulnerability allows an attacker on the network to read sensitive data from the affected system's memory without authorization.

Technologies: [Microsoft Windows Client for NFS](https://junglewise.ai/threats/technologies/windows-client-for-nfs). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-69940 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69940 being exploited in the wild.

**How severe is CVE-2026-69940?** Medium severity, with a CVSS score of 6.5, published 13 October 2026.

**Which products and versions are affected?** Microsoft Windows Client for NFS.

**Is there a fix for CVE-2026-69940?** 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-2026-69940 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-69940?** Check whether you run Microsoft Windows Client 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

An out-of-bounds read vulnerability exists in Windows Client for NFS where improper bounds checking permits reading memory regions outside intended buffer boundaries. The vulnerability is exploitable over the network and allows unauthorized information disclosure of potentially sensitive data from system memory.

## Affected products

- Microsoft Windows Client for NFS

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69940](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69940)

## Related threats

- [Microsoft Windows Client for NFS use after free privilege elevation](https://junglewise.ai/threats/cve-2026-95885-use-after-free-in-windows-client-for-nfs-allows-an-unauthorized)
- [Microsoft Windows Client for NFS use-after-free remote code execution](https://junglewise.ai/threats/cve-2026-88249-use-after-free-in-windows-client-for-nfs-allows-an-unauthorized)
- [Windows Client for NFS heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-122165-heap-based-buffer-overflow-in-windows-client-for-nfs-allows-an)
- [Microsoft Windows Client for NFS improper access control](https://junglewise.ai/threats/cve-2026-119404-improper-access-control-in-windows-client-for-nfs-allows-an)
- [Windows Client for NFS stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-118141-stack-based-buffer-overflow-in-windows-client-for-nfs-allows-an)