Vulnerability · Published Oct 13, 2026 · Assigned by microsoft
CVE-2026-70116Windows Resilient File System (ReFS) Security Feature Bypass Vulnerability
Medium 4.2
In plain English
A medium-severity stack buffer overflow in Windows 11 Version 24H2 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Severity (CVSS 3.1)4.2Medium
Exploit odds (30 days)0.4%top 70.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – before 10.0.26100.9711 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – before 10.0.26200.9711 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – before 10.0.28000.3231 |
| Microsoft | Windows 11 Version 26H2 | 10.0.26300.0 – before 10.0.26300.9711 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – before 10.0.26100.33650 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – before 10.0.26100.33650 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
References
- Windows Resilient File System (ReFS) Security Feature Bypass Vulnerability vendor-advisory, patch