# CVE-2026-68834: Microsoft Windows NTFS stack-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-68834-microsoft-windows-ntfs-stack-based-buffer-overflow  
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-2026-68834 · Severity: high · CVSS 8 · Published 2026-09-08

Windows NTFS is the file system used by all modern Windows computers to store and manage files. A stack-based buffer overflow vulnerability allows an authorized user on the network to run arbitrary code with elevated privileges, potentially gaining full control of affected systems and accessing sensitive data.

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

## Quick answers

**Is CVE-2026-68834 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-68834 being exploited in the wild.

**How severe is CVE-2026-68834?** High severity, with a CVSS score of 8, published 8 September 2026.

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

**Is there a fix for CVE-2026-68834?** 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-2026-68834 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-68834?** Check whether you run Microsoft Windows NTFS at an affected version. 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 stack-based buffer overflow vulnerability exists in the Windows NTFS file system driver. The vulnerability can be exploited by an authorized attacker over the network to achieve privilege escalation. The flaw allows an attacker with valid credentials to trigger a memory corruption condition that can be leveraged to execute arbitrary code with elevated privileges. No indication of active exploitation in the wild has been reported at this time. A security update from Microsoft is available to address this issue.

## Affected products

- Microsoft Windows NTFS <UNKNOWN>

## Timeline

- 2026-09-08: disclosed
- other: Not reported as exploited in the wild as of publication date

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68834](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68834)

## 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)