{"id":"CVE-2026-40422","title":"Use of uninitialized resource in Windows File Explorer allows an authorized attacker to disclose information locally.","summary":"Use of uninitialized resource in Windows File Explorer allows an authorized attacker to disclose information locally.","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-908"],"vendor":"microsoft","product":"windows_10_1607","affected":["windows_10_1607 < 10.0.14393.9339","windows_10_1809 < 10.0.17763.9020","windows_10_21h2 < 10.0.19044.7548","windows_10_22h2 < 10.0.19045.7548","windows_11_24h2 < 10.0.26100.8875","windows_11_25h2 < 10.0.26200.8875","windows_11_26h1 < 10.0.28000.2269","windows_server_2016 < 10.0.14393.9339","windows_server_2019 < 10.0.17763.9020","windows_server_2022 < 10.0.20348.5386","windows_server_2025 < 10.0.26100.33158"],"patched":["windows_10_1607 10.0.14393.9339","windows_10_1809 10.0.17763.9020","windows_10_21h2 10.0.19044.7548","windows_10_22h2 10.0.19045.7548","windows_11_24h2 10.0.26100.8875","windows_11_25h2 10.0.26200.8875","windows_11_26h1 10.0.28000.2269","windows_server_2016 10.0.14393.9339","windows_server_2019 10.0.17763.9020","windows_server_2022 10.0.20348.5386","windows_server_2025 10.0.26100.33158"],"published":"2026-07-14","updated":"2026-07-16","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-40422","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40422","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00404,"epssPercentile":0.34386,"ingestedAt":"2026-07-17T13:12:08.644Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-15T16:00:02.679884Z"},"slug":"CVE-2026-40422","body":"## Overview\n\nUse of uninitialized resource in Windows File Explorer allows an authorized attacker to disclose information locally.\n\n## Affected\n\n- `windows_10_1607 < 10.0.14393.9339`\n- `windows_10_1809 < 10.0.17763.9020`\n- `windows_10_21h2 < 10.0.19044.7548`\n- `windows_10_22h2 < 10.0.19045.7548`\n- `windows_11_24h2 < 10.0.26100.8875`\n- `windows_11_25h2 < 10.0.26200.8875`\n- `windows_11_26h1 < 10.0.28000.2269`\n- `windows_server_2016 < 10.0.14393.9339`\n- `windows_server_2019 < 10.0.17763.9020`\n- `windows_server_2022 < 10.0.20348.5386`\n- `windows_server_2025 < 10.0.26100.33158`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_10_1607 10.0.14393.9339`\n- `windows_10_1809 10.0.17763.9020`\n- `windows_10_21h2 10.0.19044.7548`\n- `windows_10_22h2 10.0.19045.7548`\n- `windows_11_24h2 10.0.26100.8875`\n- `windows_11_25h2 10.0.26200.8875`\n- `windows_11_26h1 10.0.28000.2269`\n- `windows_server_2016 10.0.14393.9339`\n- `windows_server_2019 10.0.17763.9020`\n- `windows_server_2022 10.0.20348.5386`\n- `windows_server_2025 10.0.26100.33158`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}