{"id":"CVE-2026-78523","title":"Use after free in Windows DNS allows an unauthorized attacker to deny service over a network.","summary":"Use after free in Windows DNS allows an unauthorized attacker to deny service over a network.","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-416"],"vendor":"microsoft","product":"windows_10_1607","affected":["windows_10_1607 < 10.0.14393.9512","windows_10_1809 < 10.0.17763.9245","windows_server_2012","windows_server_2012 = r2","windows_server_2016 < 10.0.14393.9512","windows_server_2019 < 10.0.17763.9245","windows_server_2022 < 10.0.20348.5622","windows_server_2025 < 10.0.26100.33438"],"patched":["windows_10_1607 10.0.14393.9512","windows_10_1809 10.0.17763.9245","windows_server_2016 10.0.14393.9512","windows_server_2019 10.0.17763.9245","windows_server_2022 10.0.20348.5622","windows_server_2025 10.0.26100.33438"],"published":"2026-09-08","updated":"2026-09-24","sourceUpdated":"2026-09-24T23:19:09.000","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78523","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78523","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00983,"epssPercentile":0.60676,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T20:42:15.954884Z"},"ingestedAt":"2026-09-08T19:08:49.630Z","slug":"CVE-2026-78523","body":"## Overview\n\nUse after free in Windows DNS allows an unauthorized attacker to deny service over a network.\n\n## Affected\n\n- `windows_10_1607 < 10.0.14393.9512`\n- `windows_10_1809 < 10.0.17763.9245`\n- `windows_server_2012`\n- `windows_server_2012 = r2`\n- `windows_server_2016 < 10.0.14393.9512`\n- `windows_server_2019 < 10.0.17763.9245`\n- `windows_server_2022 < 10.0.20348.5622`\n- `windows_server_2025 < 10.0.26100.33438`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_10_1607 10.0.14393.9512`\n- `windows_10_1809 10.0.17763.9245`\n- `windows_server_2016 10.0.14393.9512`\n- `windows_server_2019 10.0.17763.9245`\n- `windows_server_2022 10.0.20348.5622`\n- `windows_server_2025 10.0.26100.33438`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}