{"id":"CVE-2026-78450","title":"Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.","summary":"Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"microsoft","product":"windows_10_1809","affected":["windows_10_1809 < 10.0.17763.9245","windows_server_2019 < 10.0.17763.9245","windows_server_2022 < 10.0.20348.5622","windows_server_2025 < 10.0.26100.33438"],"patched":["windows_10_1809 10.0.17763.9245","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":"2026-09-16","sourceUpdated":"2026-09-16T20:30:36.543","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78450","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78450","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00507,"epssPercentile":0.42133,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-09T04:20:29.982974Z"},"ingestedAt":"2026-09-08T19:08:49.629Z","slug":"CVE-2026-78450","body":"## Overview\n\nUse after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.\n\n## Affected\n\n- `windows_10_1809 < 10.0.17763.9245`\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_1809 10.0.17763.9245`\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":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}