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Memory corruption

Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally

CVE-2026-83952

What this means

This is rated high severity (7.8 out of 10). There is no confirmed exploitation of it yet. Ask IT whether Microsoft Windows 11 24h2, Microsoft Windows 11 25h2 and Microsoft Windows 11 26h1, and 1 more are in your estate, and treat that as the priority.

Full vendor description

Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.

Scoring and exploitation

7.8/ 10
CVSS 3.1 base scoreHigh

Exploitable only with local access and a low-privilege account, and no one has to click or open anything. High impact on confidentiality, integrity and availability.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability

Longer bar: easier to attack

Attack vectorLocalAV:L
Attack complexityLowAC:L
Privileges requiredLowPR:L
User interactionNoneUI:N
ScopeUnchangedS:U

Impact

Longer bar: more harm

ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityHighA:H
Not reported
Exploited in the wild
Not confirmed in the
Not reported

Weaknesses

CWE-122

Affected products ()

  • Microsoft Windows 11 24h2
  • Microsoft Windows 11 25h2
  • Microsoft Windows 11 26h1
  • Microsoft Windows Server 2025
Show the raw CPE strings (7)
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

References

1 link from the CVE record, grouped by site; the vendor's advisory comes first.

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