Medium · 4.2 CVE-2026-70116 EUVD-2026-99687GHSA-9jc3-pgpm-m2g7

Windows Resilient File System (ReFS) Security Feature Bypass Vulnerability

Published Oct 13, 2026 · Updated Nov 10, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Windows 11 Version 24H2 Product: Windows 11 Version 25H2 Product: Windows 11 version 26H1 Product: Windows 11 Version 26H2 Product: Windows Server 2025 Product: Windows Server 2025 (Server Core installation) Platform: Windows

Description

Stack-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker to bypass a security feature with a physical attack.

Affected products

Vendor	Product	Affected	Fixed
Microsoft	Windows 11 Version 24H2	10.0.26100.0 – < 10.0.26100.9711	10.0.26100.9711
Microsoft	Windows 11 Version 25H2	10.0.26200.0 – < 10.0.26200.9711	10.0.26200.9711
Microsoft	Windows 11 version 26H1	10.0.28000.0 – < 10.0.28000.3231	10.0.28000.3231
Microsoft	Windows 11 Version 26H2	10.0.26300.0 – < 10.0.26300.9711	10.0.26300.9711
Microsoft	Windows Server 2025	10.0.26100.0 – < 10.0.26100.33650	10.0.26100.33650
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 – < 10.0.26100.33650	10.0.26100.33650

Advisories 2

WID-SEC-2026-3892 Microsoft Windows und Windows Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
MSRC-CVE-2026-70116 Windows Resilient File System (ReFS) Security Feature Bypass Vulnerability Microsoft Security Response Center · Oct 13, 2026

References

Windows Resilient File System (ReFS) Security Feature Bypass Vulnerability vendor-advisory patch