# CVE-2026-69949: Microsoft Windows Client for NFS heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-69949-heap-based-buffer-overflow-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-2026-69949 · Severity: high · CVSS 7.8 · Published 2026-10-13

Windows Client for NFS is a component that allows Windows systems to connect to Network File System (NFS) servers for file sharing. A heap buffer overflow in this component allows an authorized local user to execute arbitrary code and take complete control of the system.

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-2026-69949 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69949 being exploited in the wild.

**How severe is CVE-2026-69949?** High severity, with a CVSS score of 7.8, published 13 October 2026.

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

**Is there a fix for CVE-2026-69949?** 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-2026-69949 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-69949?** 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

A heap-based buffer overflow exists in the Windows Client for NFS component, exploitable by an authenticated local attacker to achieve privilege escalation. The vulnerability requires prior local access on the affected system. Successful exploitation grants the attacker elevated privileges on the Windows host.

## Affected products

- Microsoft Windows Client for NFS

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69949](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69949)

## 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)