CVE-2026-72971

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72971", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-08-10T18:36:42.030Z", "datePublished": "2026-08-11T17:05:40.177Z", "dateUpdated": "2026-11-10T21:59:22.140Z"}, "containers": {"cna": {"title": "Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability", "datePublic": "2026-08-11T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*", "versionStartIncluding": "10.0.28000.0", "versionEndExcluding": "10.0.28000.2704"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Windows 11 version 26H1", "platforms": ["ARM64-based Systems", "x64-based Systems"], "versions": [{"version": "10.0.28000.0", "lessThan": "10.0.28000.2704", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-59: Improper Link Resolution Before File Access ('Link Following')", "lang": "en-US", "type": "CWE", "cweId": "CWE-59"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-11-10T21:59:22.140Z"}, "references": [{"name": "Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72971"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 5.5, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-11T19:20:18.522655Z", "id": "CVE-2026-72971", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-11T19:20:34.118Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72971", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-11T19:20:18.522655Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-11T19:20:26.510Z"}}], "cna": {"title": "Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 5.5, "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C"}, "scenarios": [{"lang": "en-US", "value": "GENERAL"}]}], "affected": [{"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"]}], "datePublic": "2026-08-11T14:00:00.000Z", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72971", "name": "Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-59", "description": "CWE-59: Improper Link Resolution Before File Access ('Link Following')"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*", "vulnerable": true, "versionEndExcluding": "10.0.28000.2704", "versionStartIncluding": "10.0.28000.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-11-10T21:59:22.140Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72971", "state": "PUBLISHED", "dateUpdated": "2026-11-10T21:59:22.140Z", "dateReserved": "2026-08-10T18:36:42.030Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-08-11T17:05:40.177Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"platforms": ["ARM64-based Systems", "x64-based Systems"], "product": "Windows 11 version 26H1", "vendor": "Microsoft", "versions": [{"lessThan": "10.0.28000.2704", "status": "affected", "version": "10.0.28000.0", "versionType": "custom"}]}], "source": "secure@microsoft.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*", "matchCriteriaId": "BE88CAB4-881C-4300-AA9F-0E3F59371786", "versionEndExcluding": "10.0.28000.2704", "vulnerable": true}, {"criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*", "matchCriteriaId": "DBF52600-4F74-4C60-8792-0BB6CA65823A", "versionEndExcluding": "10.0.28000.2704", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally."}, {"lang": "es", "value": "Resoluci\u00f3n de enlaces incorrecta antes del acceso a archivos (\u2019seguimiento de enlaces\u2019) en el controlador de filtro del sistema de archivos de aislamiento de contenedores de Windows (unionfs.sys) permite a un atacante autorizado realizar manipulaciones localmente."}], "id": "CVE-2026-72971", "lastModified": "2026-10-24T15:10:00.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "secure@microsoft.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72971", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-11T19:20:18.522655Z", "version": "2.0.3"}}]}, "published": "2026-08-11T17:19:15.220", "references": [{"source": "secure@microsoft.com", "tags": ["Vendor Advisory", "Patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72971"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-59"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["arm64-based_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.28000.0,10.0.28000.2704)"}}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "Windows 11 version 26H1", "source": "cna", "vendor": "Microsoft"}, "product": "windows_11_26h1", "vendor": "microsoft"}], "created": "2026-08-12T19:30:08.491635+00:00", "updated": "2026-08-14T12:45:16.969530+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$windows_11_26h1"]}