{"id":"CVE-2026-50428","title":"Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability","summary":"Out-of-bounds read in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-125"],"vendor":"Microsoft","product":"Windows 11 version 26H1","affected":["windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2525"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-14T19:33:05.245070Z"},"published":"2026-07-14","updated":"2026-09-17","sourceUpdated":"2026-09-17T22:30:54.402Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-50428","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50428","label":"Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability"}],"tags":["cve.org"],"epss":0.00412,"epssPercentile":0.35037,"ingestedAt":"2026-09-08T17:06:31.919Z","slug":"CVE-2026-50428","body":"## Overview\n\nOut-of-bounds read in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.\n\n## Affected\n\n- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2525`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}