# CVE-2026-68833: Microsoft Windows NTFS heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-68833-microsoft-windows-ntfs-heap-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-2026-68833 · Severity: medium · CVSS 6.8 · Published 2026-09-08

Windows NTFS is the default file system used by most Windows computers. A heap-based buffer overflow vulnerability allows an attacker with physical access to execute arbitrary code, potentially gaining full control of the system and accessing sensitive files or data stored on the drive.

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

## Quick answers

**Is CVE-2026-68833 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-68833 being exploited in the wild.

**How severe is CVE-2026-68833?** Medium severity, with a CVSS score of 6.8, published 8 September 2026.

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

**Is there a fix for CVE-2026-68833?** 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-2026-68833 attacked?** It is attacked with physical access.

**Am I affected by CVE-2026-68833?** 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 heap-based buffer overflow exists in the Windows NTFS file system driver. The vulnerability is triggered during NTFS metadata processing and can be exploited via maliciously crafted file system structures. Physical access to the machine is required to exploit this flaw, such as by connecting a compromised storage device or modifying the file system on disk. Successful exploitation allows arbitrary code execution with kernel-level privileges. A patch is likely available through Microsoft's regular security updates.

## Affected products

- Microsoft Windows NTFS <UNKNOWN>

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68833](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68833)

## 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)