# CVE-2026-88249: Microsoft Windows Client for NFS use-after-free remote code execution

Source: https://junglewise.ai/threats/cve-2026-88249-use-after-free-in-windows-client-for-nfs-allows-an-unauthorized  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-88249 · Severity: high · CVSS 8.8 · Published 2026-11-10

Windows Client for NFS is a network file sharing component used by enterprises to access NFS (Network File System) storage. A use-after-free vulnerability allows an unauthenticated attacker on the network to execute arbitrary code with the privileges of the affected system, potentially leading to full system compromise.

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-2026-88249 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88249 being exploited in the wild.

**How severe is CVE-2026-88249?** High severity, with a CVSS score of 8.8, published 10 November 2026.

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

**Is there a fix for CVE-2026-88249?** 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-2026-88249 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-88249?** 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 use-after-free vulnerability exists in Windows Client for NFS that can be exploited via network-based attack vectors without requiring prior authentication. The vulnerability allows an attacker to achieve remote code execution by triggering memory corruption. The CVSS score of 8.8 reflects the high severity of unauthenticated remote code execution capability.

## Affected products

- Microsoft Windows Client for NFS

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88249](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88249)

## 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)
- [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)
- [Microsoft Windows Client for NFS race condition privilege escalation](https://junglewise.ai/threats/cve-2026-118138-concurrent-execution-using-shared-resource-with-improper)