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PatchSiren cyber security CVE debrief

CVE-2026-70116 Microsoft CVE debrief

A stack-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker to bypass a security feature with a physical attack. This CVE record was published on 2026-10-13T19:00:25.452Z and has not been modified since then. The NVD entry is currently Medium. The vulnerability affects multiple versions of Windows 11 and Windows Server 2025. Defenders responsible for these systems, especially those with physical access, should assess exposure and prioritize patching. The CVE Program record and NVD entry provide details on the vulnerability, but additional information on exploitation and impact is limited.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
MEDIUM 4.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows 11 and Windows Server 2025 systems, especially those with physical access, should assess exposure and prioritize patching.

Why it matters

CVE-2026-70116 is a stack-based buffer overflow vulnerability in Windows Resilient File System (ReFS) that allows an unauthorized attacker to bypass a security feature with a physical attack. Defenders should prioritize verifying exposure in Windows 11 and Windows Server 2025 systems and apply vendor patches immediately.

  • Verify exposure in Windows 11 and Windows Server 2025 systems
  • Potential security feature bypass attempts require monitoring
  • Patching is required to prevent potential security feature bypass

Technical summary

A stack-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker to bypass a security feature with a physical attack. The vulnerability affects multiple versions of Windows 11 and Windows Server 2025. Defenders should prioritize verifying exposure in these systems and apply vendor patches immediately. The CVE record and NVD entry provide details on the vulnerability, but further verification is required to determine the full scope of affected systems and potential consequences.

Defensive priority

Defenders should prioritize verifying exposure in Windows 11 and Windows Server 2025 systems, especially those with physical access. Review and apply vendor patches immediately.

Recommended defensive actions

  • Verify exposure in Windows 11 and Windows Server 2025 systems
  • Review and apply vendor patches immediately
  • Monitor systems for potential security feature bypass attempts

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, additional information on exploitation and impact is limited. Further verification is required to determine the full scope of affected systems and potential consequences.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-70116 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-70116

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-70116 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-70116

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.