# CVE-2026-50299: Microsoft Windows Storage Spaces Direct integer overflow

Source: https://junglewise.ai/threats/cve-2026-50299-microsoft-windows-storage-spaces-direct-integer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-50299 · Severity: medium · CVSS 6.8 · Published 2026-07-14

A security vulnerability exists in Windows Storage Spaces Direct, a technology used to create highly available and scalable storage using industry-standard servers. An attacker with physical access to the hardware could exploit this flaw to execute unauthorized code on the system. This could lead to a complete loss of confidentiality, integrity, and availability of the affected server and its stored data.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows Server 2012 R2](https://junglewise.ai/threats/technologies/windows-server-2012-r2), [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-50299 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-50299 being exploited in the wild.

**How severe is CVE-2026-50299?** Medium severity, with a CVSS score of 6.8, published 14 July 2026.

**Which products and versions are affected?** Microsoft Windows 11 Version 24H2, 25H2, 26H1; Microsoft Windows Server 2012 R2 All versions; Microsoft Windows Storage Spaces Direct All versions; Microsoft Windows 10 Version 1607, 1809, 21H2, 22H2.

**Is there a fix for CVE-2026-50299?** 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-2026-50299 attacked?** It is attacked with physical access, in an operating system.

**Am I affected by CVE-2026-50299?** Check whether you run Microsoft Windows 11, Microsoft Windows Server 2012 R2, Microsoft Windows Storage Spaces Direct or one of the others listed 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

This vulnerability is classified as an integer overflow or wraparound (CWE-190) which leads to a heap-based buffer overflow (CWE-122) within the Windows Storage Spaces Direct component. The attack vector is restricted to physical access (AV:P), meaning an attacker must have hands-on access to the target hardware to trigger the flaw. Successful exploitation allows for arbitrary code execution with high privileges, impacting the system's confidentiality, integrity, and availability. Microsoft has released security updates to address this issue across various versions of Windows and Windows Server.

## Affected products

- Microsoft Windows 10 Version 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 Version 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 R2 All versions
- Microsoft Windows Storage Spaces Direct All versions

## Timeline

- 2026-07-14: disclosed: Initial publication by Microsoft and NVD
- 2026-07-14: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50299](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50299)

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