CVE-2026-70116

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Windows ReFS Stack-Based Buffer Overflow Security Bypass

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70116

EUVD

EUVD-2026-99687

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a stack-based buffer overflow vulnerability in Windows Resilient File System (ReFS). It allows an unauthorized attacker to bypass a security feature by exploiting a physical attack vector.

Impact Analysis

An attacker could exploit this to bypass security features on systems using ReFS, potentially gaining unauthorized access or executing malicious actions with physical access to the device.

Compliance Impact

This vulnerability allows bypassing a security feature via physical attack, which could undermine data protection controls required by GDPR and HIPAA. Unauthorized access or data exposure risks increase, potentially violating compliance requirements for confidentiality and integrity.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the ReFS buffer overflow vulnerability. Monitor Microsoft's update guide for patches and install them as soon as available.

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