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CVE-2026-54109: Windows Resilient File System (ReFS) Remote Code Execution Vulnerability

highCVSS 7.8CVE-2026-54109
Integer overflow or wraparound in Windows Resilient File System (ReFS) allows an authorized attacker to execute code locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Resilient File System (ReFS)Remote code execution
What
Integer overflow or wraparound in Windows Resilient File System (ReFS) allows an authorized attacker to execute code locally.
Who is affected
Authorized users of Windows Resilient File System (ReFS).
Urgency
Remediation is urgent due to the high severity and potential for local code execution.
Action
Apply the latest security patch for Windows Resilient File System (ReFS).

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54109

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-54109coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Resilient File

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center