CVE-2026-62772

Heap-based buffer overflow in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62772	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*

History

23 Oct 2026, 19:10

Type	Values Removed	Values Added
Summary		(es) Desbordamiento de búfer basado en montículo en el controlador de filtro del sistema de archivos de aislamiento de contenedores de Windows (unionfs.sys) permite a un atacante autorizado elevar privilegios localmente.

Information

Published : 2026-08-11 17:18

Updated : 2026-10-24 16:10

NVD link : CVE-2026-62772

Mitre link : CVE-2026-62772

CVE.ORG link : CVE-2026-62772

JSON object : View

Products Affected

microsoft

windows_11_26h1

CWE

CWE-122

Heap-based Buffer Overflow

{"id": "CVE-2026-62772", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-62772", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-08-12T13:39:06.890688Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Windows 11 version 26H1", "versions": [{"status": "affected", "version": "10.0.28000.0", "lessThan": "10.0.28000.2704", "versionType": "custom"}], "platforms": ["ARM64-based Systems", "x64-based Systems"]}]}], "published": "2026-08-11T17:18:29.930", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62772", "tags": ["Patch", "Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "Heap-based buffer overflow in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally."}, {"lang": "es", "value": "Desbordamiento de b\u00fafer basado en mont\u00edculo en el controlador de filtro del sistema de archivos de aislamiento de contenedores de Windows (unionfs.sys) permite a un atacante autorizado elevar privilegios localmente."}], "lastModified": "2026-10-24T16:10:00.153", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*", "vulnerable": true, "matchCriteriaId": "BE88CAB4-881C-4300-AA9F-0E3F59371786", "versionEndExcluding": "10.0.28000.2704"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*", "vulnerable": true, "matchCriteriaId": "DBF52600-4F74-4C60-8792-0BB6CA65823A", "versionEndExcluding": "10.0.28000.2704"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}