What is CVE-2026-70116?

CVE-2026-70116 is a medium-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Stack-based Buffer Overflow. CVSS score: 4.2/10. Published 2026-10-13.

How severe is CVE-2026-70116?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Buffer overflow in Microsoft Windows 11 Version 24h2

CVE-2026-70116

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

Vulnerability class: Buffer Overflow

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-70116?: CVE-2026-70116 is a medium-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Stack-based Buffer Overflow. CVSS score: 4.2/10. Published 2026-10-13.
How severe is CVE-2026-70116?: Medium severity. CVSS v3 base score is 4.2 out of 10.