# CVE-2026-68841: Microsoft Windows NTFS heap buffer overflow privilege escalation

Source: https://junglewise.ai/threats/cve-2026-68841-microsoft-windows-ntfs-heap-buffer-overflow-privilege-escalation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-68841 · Severity: high · CVSS 7.8 · Published 2026-09-08

Windows NTFS is a core component of Microsoft Windows that manages file storage and access on hard drives. A heap buffer overflow vulnerability in NTFS allows an attacker with local access to overwrite memory and escalate their privileges to system administrator level, potentially gaining complete control of an affected computer.

Technologies: [Microsoft Windows NTFS](https://junglewise.ai/threats/technologies/windows-ntfs). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-68841 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-68841 being exploited in the wild.

**How severe is CVE-2026-68841?** High severity, with a CVSS score of 7.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows NTFS.

**Is there a fix for CVE-2026-68841?** 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-2026-68841 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-68841?** Check whether you run Microsoft Windows NTFS. 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 heap-based buffer overflow in the Windows NTFS file system driver. An authenticated local attacker can trigger the overflow through a specially crafted file system operation, corrupting heap memory and achieving arbitrary code execution with elevated privileges. The attack requires local access and valid credentials, but does not require user interaction beyond initiating the malicious operation. The attacker can leverage this to execute code with SYSTEM-level privileges, effectively compromising the entire machine. A patch is expected to be available through Microsoft's regular security update process.

## Affected products

- Microsoft Windows NTFS

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68841](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68841)

## Related threats

- [Windows NTFS pointer dereference remote code execution](https://junglewise.ai/threats/cve-2026-105542-untrusted-pointer-dereference-in-windows-ntfs-allows-an)
- [Windows NTFS improper access control information disclosure](https://junglewise.ai/threats/cve-2026-83864-improper-access-control-in-windows-ntfs-allows-an-authorized)
- [Windows NTFS format string privilege elevation](https://junglewise.ai/threats/cve-2026-83585-use-of-externally-controlled-format-string-in-windows-ntfs-allows)
- [Windows NTFS out-of-bounds read privilege escalation](https://junglewise.ai/threats/cve-2026-83508-out-of-bounds-read-in-windows-ntfs-allows-an-authorized-attacker)
- [Windows NTFS integer overflow allows privilege escalation](https://junglewise.ai/threats/cve-2026-69916-integer-overflow-or-wraparound-in-windows-ntfs-allows-an)